[TagZilla] Can't get rid of old Tagzilla profile

[Baasha]

Hi,
I am running (or rather trying to run) TZ 0.064on a Linux Ubuntu 
system.  In the Preferences window I am unable to get the file picker to 
work.  Clicking on Choose does nothing.  I thought that perhaps the TZ 
profile was corrupted from earlier versions of TZ, so I searched around 
and found an extension profile for TZ located in my .mozilla-thunderbird 
directory.  I uninstalled TZ and deleted this profile and then 
re-installed TZ.  When I go back into the Preferences window, the old 
directory location is still showing in the file picker.  Does anyone 
know where this information is stored?  Failing that, does anyone have 
any ideas about why my file picker does not work?  Older versions of TZ 
(0.059) worked great on my system up until TB was upgraded.  I always 
assumed this problem was because of the incompatibility of TZ with the 
later versions of TB, but maybe not.  I could really use some help 
here.  I love TZ but have been without it for some months now.

TIA,
Bob