I'm sorry for replying to you guys so late, but I'm just now starting to help Mac users here
I have 2 questions:
1) Does this problem still happen?
2) If so, upgrade to the latest OS X (10.8.3) and update to the latest CCleaner version (1.07.133)
3) If it then still happens, please post a list of all the apps you have installed. Perhaps there's an app you both have installed that creates this problem.
If it still happens, I'll dig deeper