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Unable to view unread only messages

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I have both Gmail and Aol accounts on my installation, 115.9.0. My aol account is behaving funny. If I choose to display only unread emails, the screen goes blank and no messages show. I then click on sent message, click back on incoming and the messages reappear in the "all" messages display. The Gmail account is just fine, I can click between "All" and "Unread only" with no issues. Can't figure out what's going on.

I have both Gmail and Aol accounts on my installation, 115.9.0. My aol account is behaving funny. If I choose to display only unread emails, the screen goes blank and no messages show. I then click on sent message, click back on incoming and the messages reappear in the "all" messages display. The Gmail account is just fine, I can click between "All" and "Unread only" with no issues. Can't figure out what's going on.

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I had the same sport of madness on one of my local folders since 115 was released. Nothing I did would fix it, until closed Thunderbird and deleted the relevant MSF file in the profile for that folder. Once I restarted Thunderbird everything was ok and has been since.

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I have the same problem now. I've found 6"MSF" files. I have several gmail accounts and 4 MSF files with "gmail" in their names but how do I know which one is the right one to delete".

...and what do "MSF" files do? Their size is tiny (2 KB)

Thank you.