I got the latest, I'll give it a shot next time I run a 5-man.
In the meantime, I now get the following when I click on the FuBar widget to do a roll:
[2007/02/08 17:35:22-447-x1]: FuBar_GroupFu-1\GroupFu.lua:209: attempt to index a nil value
FuBarPlugin-2.0-27487:347: in function `runChildren'
Tablet-2.0-27116 (TabletLib):2497: in function `children'
Tablet-2.0-27116 (TabletLib):2508: in function `Open'
Tablet-2.0-27116 (TabletLib):2640: in function <Interface\AddOns\TabletLib\Tablet-2.0\Tablet-2.0.lua:2634>
FuBarPlugin-2.0-27487:396: in function <...\FuBarPlugin-2.0\FuBarPlugin-2.0\FuBarPlugin-2.0.lua:395>
... I'm expecting that's unrelated to what you just fixed. I know there was just a FuBarPlugin-2.0 update, so perhaps related there (I tend to track HEAD on all my libs). Probably worth checking out. Let me know if you need any more info on that one.