Avast blocking Gmail downloads

Hi all,

I just had a strange problem with Avast. For the past 2 days (since May 26 at 9 am Central US Time), it has been preventing one of my two Gmail addresses from downloading into Thunderbird. Instead, Avast caused Thunderbird to continually download the same message over 300 times. I had to disable the Mail Shield and Anti-Spam to get my email to come into Thunderbird at all.

Has anyone else had this problem and, if so, how did you resolve it?

Thanks!

– G.K.