Can you post your Troubleshooting Information? Help (Alt-H) - Troubleshooting Information

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 Application Basics

   Name: Thunderbird
   Version: 31.6.0
   User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0
   Profile Folder: Show Folder

             (Local drive)
   Application Build ID: 20150330093429
   Enabled Plugins: about:plugins
   Build Configuration: about:buildconfig
   Memory Use: about:memory

 Mail and News Accounts
   account1:
     INCOMING: account1, , (pop3) pophm.sympatico.ca:995, SSL, passwordCleartext
     OUTGOING: smtphm.sympatico.ca:25, alwaysSTARTTLS, passwordCleartext, true

   account2:
     INCOMING: account2, , (none) Local Folders, plain, passwordCleartext

   account4:
     INCOMING: account4, , (imap) pophm.sympatico.ca:995, SSL, passwordCleartext
     OUTGOING: smtp-mail.outlook.com:587, alwaysSTARTTLS, passwordCleartext, true

 Crash Reports

 Extensions
   Tag Toolbar, 0.8.35, true, {61A64500-335C-418D-8FCB-E072A9ABF3DA}
   Lightning, 3.3.3, false, {e2fda1a4-762b-4020-b5ad-a41df1933103}

 Important Modified Preferences

   Name: Value

     accessibility.typeaheadfind.flashBar: 0
     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
     extensions.lastAppVersion: 31.6.0
     font.internaluseonly.changed: true
     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: d83db382-9390-4581-a8b5-5e4bfd3bf03
     network.cookie.prefsMigrated: true
     places.database.lastMaintenance: 1429422326
     places.history.expiration.transient_current_max_pages: 104858
     plugin.importedState: true

 Graphics

     Adapter Description: AMD Radeon HD 5800 Series
     Vendor ID: 0x1002
     Device ID: 0x6899
     Adapter RAM: 1024
     Adapter Drivers: aticfx64 aticfx64 aticfx64 aticfx32 aticfx32 aticfx32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64
     Driver Version: 13.251.0.0
     Driver Date: 12-6-2013
     Direct2D Enabled: true
     DirectWrite Enabled: true (6.2.9200.16571)
     ClearType Parameters: ClearType parameters not found
     WebGL Renderer: false
     GPU Accelerated Windows: 2/2 Direct3D 10

     AzureCanvasBackend: direct2d
     AzureSkiaAccelerated: 0
     AzureFallbackCanvasBackend: cairo
     AzureContentBackend: direct2d

 JavaScript

 Incremental GC: 1

 Accessibility

   Activated: 0
   Prevent Accessibility: 0

 Library Versions

     Expected minimum version
     Version in use

     NSPR
     4.10.6
     4.10.6

     NSS
     3.16.2.3 Basic ECC
     3.16.2.3 Basic ECC

     NSS Util
     3.16.2.3
     3.16.2.3

     NSS SSL
     3.16.2.3 Basic ECC
     3.16.2.3 Basic ECC

     NSS S/MIME
     3.16.2.3 Basic ECC
     3.16.2.3 Basic ECC

... the server name is indeed an IMAP.

There is one IMAP account according to the Troubleshooting Information. But the server name is pophm.sympatico.ca.

What are the correct server settings for IMAP according to Bell technical support?

I will have to call back and check. When I first noticed the problem, the server was an imap but, after talking to Bell I was told it should be a pophm. The problem with the disappearing folders occurred using the old imap server name and switching it to the pophm name didn't fix it. So maybe I have two problems now.

Update:

After talking to Bell "technical support," I am assured they have no imap servers. I don't remember anything about setting up this account so I am not sure how it was configured for imap. I think I used TB's wizard, but I can't be sure. Either way, the problem occurred before I changed the name from the the imap server to the pophm server and making that change didn't fix the problem.

Rebooting the computer resurrected the missing folders. But now they are empty and clicking on them causes TB to show the busy icon beside the cursors for a few minutes with no apparent effect after it stops.