C-c behaving wierd in Emacs on Mac

[Torben Hoffmann]

Hi,

I am experiencing a weird behaviour with C-c: when I press it alone Emacs 
almost instantly completes with a timeout and I am left with no action.

In some modes I can do a C-c C-c to comment out the marked region, but due to 
the weird C-c behaivour I have to do 4 times C-c in order to get what I want.

I am using Emacs.app 24.1.50, so it should be vanilla GNU Emacs I am using (or 
as close as you can get to that on a Mac).

Any clues?

Thanks in advance,
___
 /orben