Hi, all,
This is certainly not the proper place to post this, but i'm guessing that the author(s) of the VC plugin are on this list...
in the Commit dialog, both "Commit" and "Cancel" have the same accelerator key (Alt-C), so the hotkey cannot be used to activate/close the dialog. (Instead, pressing Alt-C multiple times toggles between both buttons.)
Happy Hacking!