closing thunderbird 3.0b4 fails to end processes

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http://forums.fedoraforum.org – since updating from thunderbird 3.0b3 to 3.0b4, thunderbird no longer closes properly when using file - quit. the windows close but the processes are left running and i have to kill them. it does this in normal mode and safe mode however, if i move my .thunderbird directory out of the way and set up an account from scratch it seems to work ok but i don't really want to have to fully reconfigure everything from scratch. has anyone else seen this and does anyone know how to identify the offending setting/addon/etc. ? cheers. (HowTos)