Joe, this sounds like a different issue from the one originally reported here.
A cursory glance at the upstream bugs for drag'n'drop didn't find matching issues.
Paul & Joe: would you mind filing upstream bug reports at https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird, and sharing the links to them here?
Joe, this sounds like a different issue from the one originally reported here.
A cursory glance at the upstream bugs for drag'n'drop didn't find matching issues.
Paul & Joe: would you mind filing upstream bug reports at https:/ /bugzilla. mozilla. org/enter_ bug.cgi? product= Thunderbird, and sharing the links to them here?