Bitdefender interference with Thunderbird?
Since I installed Bitdefender, I've been getting intermittent error messages like the following when I attempt to "get messages" or send a message in Thunderbird:
That message pops up in the lower right-hand corner of my desktop. I also get a message like the following in the middle of the Thunderbird UI:
I've tried reducing the number of cached connections in the IMAP server settings from the default value (which I think was 4 or 5) to 1. I shouldn't have had to do that, but I tried anyway, and it didn't help.
I've also tried adding Thunderbird as an application exception. I think that mainly applies to applications accessing protected folders, and that didn't make any difference anyway.
Meanwhile, the Mozilla wiki (http://kb.mozillazine.org/Antivirus_software#Antivirus_program_settings) lists only Avast!, AVG, NOD32, and Kaspersky as compatible AV programs.
Accordingly, should I seek a refund for my Bitdefender subscription (obtained just a few weeks ago), or is there a fix for this?
Using Windows 10 and Thunderbird 68.8.1