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Thanks for the prompt help Felix!
I agree it seems to be a minor bug in Mountain Lion that is affecting Remote Buddy. It looks like they switched around some stuff in Mission Control regarding which keystrokes can be used as shortcuts. (which may be why the "ctrl+->" and "ctrl+<-" are inadvertently trigging the Remote Buddy menu)
*it is very brief...pops up for 1-3 seconds
Thanks for asking.
Since Remote Buddy doesn't show the menu during space switches (its window is hidden at that time), this most likely is a bug in the Window Manager of OS X Mountain Lion.
I'm still investigating this issue, but am positive it can be worked around from my side.
Best regards,
Felix Schwarz