1. Help > troubleshooting information. Click the show profile button Close Thunderbird. Delete the files Foldertree.json. Panacea.dat session.json XULstore.json Localstore.rdf Restart Thunderbird.

2.

3. On the toolbar then  Select add-on and see what the issue with the lightning add-on is. It might just be waiting for a restart.

4. Is probably a symptom of 2.

I have deliberately not addressed 2 as it is probably your anti virus getting all excited about this new foreign program. In a day or two it should get instructions from home that Thunderbird 38.3 is ok. Or you could manually tell your anti virus to stop scanning the Thunderbird profile folder and making things slow.

Hello Matt, Did all of #1. Did #3. There is nothing indicating an issue with Lightning.

I don't have that many add-ons. Adblock Plus 2.6.11, gContactSync 2.0.7, Lightning 4.0.3 and Provider for Google Calendar 1.0.4.

I disabled all of the add-ons one at a time and then in groups. I can resolve all of the issues I am having by disabling Lightning (except the calendar). No other combination has any affect. I am afraid the issue has something to do with Lightning.

Ok what calendars do you have in Lightning. Provider and name please.

I am looking mostly for things like the Google birthday calendar, but all remote calendars are suspect.

If all else fails, and there are only a few calendar, you might try disabling some or all and working backwards. Usually it is a single calendar that is at issue. Usually birthdays or holidays or such like, not general calendars. But when there is an issue. Nothing is really sacrosanct in trying to root it out.

I have 4 calendars, all of them google, none of them Google Birthday or holiday. I cannot get to the calendars. If I have Lightning enabled, everything locks up. If I disable Lightning, I can navigate folders and emails, but can't do anything with calendars. When I start in safe mode, I still loose Lightning.

dale

I get the issue with calendars, safe mode disables add-ons hence no calendar.

Can you go into the Help menu > troubleshooting information and copy to clipboard and paste into a reply on the forum?

Are your using The provider for Google calendar add-on or caldav connections for the calendars. With the calendar enabled, Click on the blue monitor icons in the bottom left of the window to enter offline mode.

Is there an improvement in offline mode (mail and sync will be broken, I am looking for bread crumbs not a cure.

While in offline mode open your calendar Right click the calendar entry on the left and select properties Disable offline support click the blue icons to re enable online mode. Does disabling offline support help?

Finally if none of the above is showing signs of improvement, restart the operating system in safe mode with Networking. This loads only the very basics needed to start your computer while enabling an Internet connection. Click on your operating system for instructions on how to start in safe mode: Windows 8, Windows 7, Windows Vista, Windows XP, OSX

If safe mode for the operating system fixes the issue, there's other software in your computer that's causing problems. Possibilities include but not limited to: AV scanning, virus/malware, background downloads such as program updates.

First, With Lightning enabled, I get what you see in the screen capture. There isn't any menu item to get to the calendars and when I click any sub menu item nothing happens. So, I am unable to enter offline mode. As i posted earlier, I am using Provider for Google Calendar, but having that enabled or disabled doesn't change my ability to get into a calendar or for other menu options to work. Since I started typing this and was in the middle of another task I will restart with networking in safe mode and post the results. For me the only thing that changed when this occured was the update to 38.3.0. 38.2.0 worked perfect! Below is the help>troubleshooting information:

 Application Basics

   Name: Thunderbird
   Version: 38.3.0
   User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0
   Profile Folder: Show Folder

             (Local drive)
   Application Build ID: 20150928051427
   Enabled Plugins: about:plugins
   Build Configuration: about:buildconfig
   Memory Use: about:memory

 Mail and News Accounts
   account2:
     INCOMING: account2, , (none) Local Folders, plain, passwordCleartext

   account4:
     INCOMING: account4, , (imap) eros.lunarpages.com:993, SSL, passwordCleartext
     OUTGOING: mail.absoluteprod.com:587, alwaysSTARTTLS, passwordCleartext, true

   account5:
     INCOMING: account5, , (imap) eros.lunarpages.com:993, SSL, passwordCleartext
     OUTGOING: mail.absoluteprod.com:587, alwaysSTARTTLS, passwordCleartext, true

   account6:
     INCOMING: account6, , (imap) mail.absoluteprod.com:143, alwaysSTARTTLS, passwordCleartext
     OUTGOING: mail.absoluteprod.com:587, alwaysSTARTTLS, passwordCleartext, true

   account7:
     INCOMING: account7, , (imap) mail.absoluteprod.com:143, alwaysSTARTTLS, passwordCleartext
     OUTGOING: mail.absoluteprod.com:587, alwaysSTARTTLS, passwordCleartext, true

 Crash Reports

 Extensions
   Adblock Plus, 2.6.11, true, {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}
   gContactSync, 2.0.7, true, gContactSync@pirules.net
   Provider for Google Calendar, 1.0.4, true, {a62ef8ec-5fdc-40c2-873c-223b8a6925cc}
   Lightning, 4.0.3, false, {e2fda1a4-762b-4020-b5ad-a41df1933103}

 Important Modified Preferences

   Name: Value

     browser.cache.disk.capacity: 358400
     browser.cache.disk.smart_size_cached_value: 358400
     browser.cache.disk.smart_size.first_run: false
     browser.cache.disk.smart_size.use_old_max: false
     dom.max_chrome_script_run_time: 0
     extensions.lastAppVersion: 38.3.0
     font.internaluseonly.changed: false
     font.name.monospace.el: Consolas
     font.name.monospace.tr: Consolas
     font.name.monospace.x-baltic: Consolas
     font.name.monospace.x-central-euro: Consolas
     font.name.monospace.x-cyrillic: Consolas
     font.name.monospace.x-unicode: Consolas
     font.name.monospace.x-western: Consolas
     font.name.sans-serif.el: Calibri
     font.name.sans-serif.tr: Calibri
     font.name.sans-serif.x-baltic: Calibri
     font.name.sans-serif.x-central-euro: Calibri
     font.name.sans-serif.x-cyrillic: Calibri
     font.name.sans-serif.x-unicode: Calibri
     font.name.sans-serif.x-western: Calibri
     font.name.serif.el: Cambria
     font.name.serif.tr: Cambria
     font.name.serif.x-baltic: Cambria
     font.name.serif.x-central-euro: Cambria
     font.name.serif.x-cyrillic: Cambria
     font.name.serif.x-unicode: Cambria
     font.name.serif.x-western: Cambria
     font.size.fixed.el: 14
     font.size.fixed.tr: 14
     font.size.fixed.x-baltic: 14
     font.size.fixed.x-central-euro: 14
     font.size.fixed.x-cyrillic: 14
     font.size.fixed.x-unicode: 14
     font.size.fixed.x-western: 14
     font.size.variable.el: 17
     font.size.variable.tr: 17
     font.size.variable.x-baltic: 17
     font.size.variable.x-central-euro: 17
     font.size.variable.x-cyrillic: 17
     font.size.variable.x-unicode: 17
     font.size.variable.x-western: 17
     gfx.direct3d.last_used_feature_level_idx: 0
     mail.openMessageBehavior.version: 1
     mail.winsearch.firstRunDone: true
     mailnews.database.global.datastore.id: d2c7f45f-f22a-4470-a95d-1894b298908
     mailnews.database.global.views.conversation.columns: {"threadCol":{"visible":true,"ordinal":"1"},"flaggedCol":{"visible":true,"ordinal":"3"},"attachmentCol":{"visible":false…
     mailnews.database.global.views.global.columns: {"threadCol":{"visible":true,"ordinal":"1"},"flaggedCol":{"visible":true,"ordinal":"3"},"attachmentCol":{"visible":false…
     network.cookie.prefsMigrated: true
     network.predictor.cleaned-up: true
     places.database.lastMaintenance: 1443582846
     places.history.expiration.transient_current_max_pages: 104858
     plugin.importedState: true
     print.printer_Color_Laser.print_bgcolor: false
     print.printer_Color_Laser.print_bgimages: false
     print.printer_Color_Laser.print_colorspace:
     print.printer_Color_Laser.print_command:
     print.printer_Color_Laser.print_downloadfonts: false
     print.printer_Color_Laser.print_duplex: 0
     print.printer_Color_Laser.print_edge_bottom: 0
     print.printer_Color_Laser.print_edge_left: 0
     print.printer_Color_Laser.print_edge_right: 0
     print.printer_Color_Laser.print_edge_top: 0
     print.printer_Color_Laser.print_evenpages: true
     print.printer_Color_Laser.print_footercenter:
     print.printer_Color_Laser.print_footerleft: &PT
     print.printer_Color_Laser.print_footerright: &D
     print.printer_Color_Laser.print_headercenter:
     print.printer_Color_Laser.print_headerleft: &T
     print.printer_Color_Laser.print_headerright: &U
     print.printer_Color_Laser.print_in_color: true
     print.printer_Color_Laser.print_margin_bottom: 0.5
     print.printer_Color_Laser.print_margin_left: 0.5
     print.printer_Color_Laser.print_margin_right: 0.5
     print.printer_Color_Laser.print_margin_top: 0.5
     print.printer_Color_Laser.print_oddpages: true
     print.printer_Color_Laser.print_orientation: 0
     print.printer_Color_Laser.print_page_delay: 50
     print.printer_Color_Laser.print_paper_data: 1
     print.printer_Color_Laser.print_paper_height: 11.00
     print.printer_Color_Laser.print_paper_name:
     print.printer_Color_Laser.print_paper_size_type: 0
     print.printer_Color_Laser.print_paper_size_unit: 0
     print.printer_Color_Laser.print_paper_width: 8.50
     print.printer_Color_Laser.print_plex_name:
     print.printer_Color_Laser.print_resolution: 0
     print.printer_Color_Laser.print_resolution_name:
     print.printer_Color_Laser.print_reversed: false
     print.printer_Color_Laser.print_scaling: 1.00
     print.printer_Color_Laser.print_shrink_to_fit: true
     print.printer_Color_Laser.print_to_file: false
     print.printer_Color_Laser.print_unwriteable_margin_bottom: 0
     print.printer_Color_Laser.print_unwriteable_margin_left: 0
     print.printer_Color_Laser.print_unwriteable_margin_right: 0
     print.printer_Color_Laser.print_unwriteable_margin_top: 0

 Graphics

     Adapter Description: AMD Radeon HD 6350
     Vendor ID: 0x1002
     Device ID: 0x68f9
     Adapter RAM: 512
     Adapter Drivers: aticfx64 aticfx64 aticfx64 aticfx32 aticfx32 aticfx32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64
     Driver Version: 14.501.1003.0
     Driver Date: 11-20-2014
     Direct2D Enabled: false
     DirectWrite Enabled: false (6.2.9200.17461)
     ClearType Parameters: ClearType parameters not found
     WebGL Renderer: false
     GPU Accelerated Windows: 0

     AzureCanvasBackend: skia
     AzureSkiaAccelerated: 0
     AzureFallbackCanvasBackend: cairo
     AzureContentBackend: cairo

 JavaScript

 Incremental GC: 1

 Accessibility

   Activated: 0
   Prevent Accessibility: 0

 Library Versions

     Expected minimum version
     Version in use

     NSPR
     4.10.8
     4.10.8

     NSS
     3.19.2 Basic ECC
     3.19.2 Basic ECC

     NSS Util
     3.19.2
     3.19.2

     NSS SSL
     3.19.2 Basic ECC
     3.19.2 Basic ECC

     NSS S/MIME
     3.19.2 Basic ECC
     3.19.2 Basic ECC

Thanks!

I did a Windows safe mode start with Networking. Same results, with Lightning enabled nothing works.

Indeed, reports indicate this is caused by the Calendar addon.

For Windows, 1. install older version from http://releases.mozilla.org/pub/mozilla.org/thunderbird/releases/38.2.0/win32/en-US/Thunderbird%20Setup%2038.2.0.exe 2. remove calendar addon, restart thunderbird 3. update thunderbird at help | About 4. reinstall calendar addon

Does that help?

Thanks to everyone. One note: After installing and opening .2.0, Lightning wasn't enabled and said not compatible with .2.0. I removed it and followed the directions, but it leads me to believe I could have removed it from .3.0 uninstalled and reinstalled, which would have saved a few steps or perhaps just removed lightning and reinstalled it. Just a thought, but once again thanks.

Updated to 38.4.0 yesterday. Same trouble. This time I did a safe mode start removed Lightning, restarted, and added lightning back. Fixed the problem.

Thanks for the report. Greatly appreciated.

So I believe you currently should have Lightning 4.0.3.1 installed.

yes, Lightning is 4.0.3.1. I didn't check the version before the re-install however.