Norton has been known to cause a few problems with ContactMonkey. But luckily it's simple to fix!
You've probably received an error about "cmconnect.exe". I would like to point out that Symantec hasn't actually detected any malicious code in the "cmconnect.exe" file, it just has a low "Reputation" because it's a new file and is not used by a large number of Symantec users. Here's an article from Symantec explaining their reputation detection method.
If you get the following screen, click "Options".