Tell me what you are trying to do with this macro and we might be able to help you more. Check in all your macros that you don't have a hot key that ONLY uses the "C" key. If you have it will trigger something that you might not be seeing and it is short circuting the normal use of the key.
ALSO If you make sure that after "if" at the top of the box it says "all the following are true". You might have it set to "if any of the following are true": that is no good and you will get terrible results, it will trigger every time you press either 'c' or 'command' and really mess stuff up for you.
This is not really a 'hot key', it is set of conditions that are being looked out for while the macro runs. They will when satisfied, act as a kind of 'trigger' but don't think of them as 'hot keys'.
The issue here is to look out for conflicts with other hot keys you use and other macros.
Upload if you can a picture of the macro you are trying to
make. Don't upload the actual macro just an image. Here is how to do that.