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For the past 2 days, either my inbox is empty on startup, or if I see my messages, they disappear completely once I open any folder. Also, I have over 2400 messages in Trash, and can't empty the folder. No settings or connections were changed. What gives?

OK, so I see where others Thunderbird users have previously asked about why e-mails are disappearing from their Thunderbird junk folder but have a quite different problem. So, when I go to my junk folder momentarily all the mails are present, but then right before my eyes 2 or 3 just simply disappear! They truly disappear and are nowhere in any folder on Thunderbird account -trash, archives, sent, etc. I did the obvious and Googled and there are some informative posts about Thunderbird settings for time-outs and filters and automatic deletion - BUT, BIG BUT all my settings conform already to all their suggestions on these various web posts. So at my wits end I ask the folks in the community if they have any explanation as to why e-mails in junk folder on Thunderbird literally just disappear in front of me. I would be greatly appreciative of any suggestions.