It seems that text in bold text links on the TFP won't open in a new tab.. regular text links seem to work...
(edit: They'll open in a new tab, but not by middle clicking..)
I upgraded to 1.07 from.. 1.Hell.If.I.Know..
I checked the settings, and the only extension I had that has anything to do with tabbed browsing at all was called "Single Window"
http://www.spuler.us/extensions/singlewindow.htm but it updated ith 1.07 and doesnt seem to have anything to do with the problem.
I checked all the tabbed browsing settings in the options but nothing really seems to fix it.