I found a small bug.
Go to Tools -> Plug-in Manager -> Input -> MPC Plugin -> Configure
The config dialog has a standard windows frame instead of a MC skinned frame:
(http://www.pix01.com/gallery/BD01FC74-5847-4306-A29B-3AA1BF99BB82/MC13_._PlugIn_Options_Drawing_Bug/5526751300.jpg)
After closing this dialog and switchen to another input PlugIn it looks like this:
(http://www.pix01.com/gallery/BD01FC74-5847-4306-A29B-3AA1BF99BB82/MC13_._PlugIn_Options_Drawing_Bug/5526751301.jpg)
And after reopening the Plug-in Manager it looks lieke this:
(http://www.pix01.com/gallery/BD01FC74-5847-4306-A29B-3AA1BF99BB82/MC13_._PlugIn_Options_Drawing_Bug/5526751302.jpg)
There are also a few window drawing bugs in other parts of MC after selecting to configure the MPC Plugin.