Looks like the regression bug is fixed - great job!
One other issue I notice, is that if I indicate for all the sidebar widgets to not be shown in say "extra posts", it works up until there is one widget left in the sidebar. When I then indicate that the last widget is not to be shown, it seems like a bunch of, maybe, default widgets come up. i.e. I turned search, custom menu, etc off. After all widgets in sidebar are off, then a sidebar with search, navigation, archives, etc. comes up.
This may just be the way wp works? Don't know.
Thanks again for fixing the regression bug.