Message filters stopped working in both accounts

Hi Forum Folke! Just upgraded to most current version 102.1.2 thinking this might solve the issue; it didn't. Yesterday: filters working fine. Rebuilding filter pile after having to re-install one of two email accounts. Write it, run it, message(s) disappear. I re-installed this account last week sometime, so this isn't an immediate "post-reinstall" issue. Just showed up some time after yesterday evening. Not now. Today, pre-update, write filter, hit 'run now,' and absolutely nothing happens. Doesn't matter how many filter terms I enter, it just won't delete the message. This happens in both email accounts (one gmail, other with ISP which is FairPoint, now Consolidated Communications). Noted one odd thing: Windows' blue "loading" whirly circle NEVER stops when I'm in the Fairpoint account; it's not present when I'm in the gmail account. There are no downloads going on (at least, there's nothing in the status bar at the bottom.) Haven't the first idea where to start looking; any ideas?? Update: Noted that when requesting download Fairpoint emails via "get messages," status bar shows "Checking mail server capabilities." and that's it. It never seems to determine what those capabilities are.... Update Two: Pulled the plug on the account; deleted it and re-installed it, and now things seem to be working fine. Thanks for reading, anyway!