I have Thunderbird V115.15 in Windows 7. Last week it stopped working correctly. Now if it starts a download from gmail it fails saying the account is being accessed by something else (but it isn't). Then when it does try to download the messages I either get 3 to 10 copies of every message or every message is blank and from a blank sender. Right now it is reporting 542 messages being downloaded but all are empty with no from info and those messages are from a week ago. I am pulling my hair out trying to get this back to functioning! Thank you