Have Win 7 Dell 32 bit desktop and latest Thunderbird. Can't tell you version cause I can't open About. My wife swears she just deleted one inbox msg and now TB isn't responding. Popup says that script is busy or not responding, do you want to wait or stop it. Script: chrome://messenger/content/tabmail.xml:1435 I click stop or wait and it won't respond. Opened in safe mode for TB but the same script box and not responding. Can't click on anything in TB. One time it allowed me to open addons and I quickly removed the two that were there but disabled. Did Win safe mode but TB didn't respond there either. Tried a System Restore to yesterday. It was successful but no change in TB. I added thunderbird.exe as an exception to Avast.