I've update to Thunderbird 3.1.2. Eset Smart Security Extension 18.104.22.168 is installed. When I close Thunderbird the mail client crashes often and sends a crash report. From the crash report: Signature eplgTbEmon.dll@0x13881 Crash Reason EXCEPTION_ACCESS_VIOLATION Crash Address 0x2ffff4c So it seems the the crash is induced by NOD32. Therefore I deactivated the Eset Add-on. Now all works fine again, no crashes. How can I (you?) fix it?