I noticed the same thing. Happened at the worst possible time, as I was monitoring active sessions for a huge update process initiated in PL/SQL Developer. :(
I'm using PL/SQL Developer version 10.0.4.1708, running on 64-bit Windows 7. For some reason the Commit and Rollback buttons on the toolbar are not responding, either when I click on them or when I try the hotkeys for them, F10 and Shift-F10. The only option is to type ROLLBACK or COMMIT in the...