Mac Notes Keeps Opening Up every 5 seconds Yesterday, I decided to set up iMessage on my Macbook Pro.  And ever since then, Mac Notes keeps opening up every 5 seconds.  I close it, or force quit, and it opens again in 5 seconds.  But even when it's idle Mac Notes is restarting every 5 seconds, and assumes priority on my screen, so I am battling to type and work on my Mac.  It's as though it wants to create a new note each time.

Macbook Pro
Mountain Lion OSX 10.8.3
If you previously had Twonky Media Server installed and removed it, that could be the culprit. I had the same issue, though with Lotus Notes (also conveniently called Notes.app), starting/popping up every 5 seconds.

CleanTwonkyServerData.command (in /Users/Shared) was the culprit, it might be the same for you.