windows 8.1 and thunderbird 38.1. booted up this morning and checked email. Tried to open a new message I received and the from address is set as me, the to address is set as me and i'm not in the usual read message view - i can start typing and edit the message. I open and create messages in new windows versus tabs. I've restarted TB many times. I updated windows updated (had not updated in 30 days). restarted. still have the problem. Upon further investigation, I can move a new message from the inbox to, for example, junk mail folder, and the message opens normally. I can open messages already read normally. It's only unread new mail. If I move an unread new message and open in another folder then move back, it works fine. errors in the TB error console: Timestamp: 7/27/2015 12:17:57 PM Error: path is null Source File: resource://gre/modules/osfile/ospath_win.jsm Line: 220 There were other errors in there before but not appearing each time. There are also loads of css warnings and messages about chrome for some reason. I don't know if any of these messages were appearing before today, as i've never had a problem with TB before.