First, use the links in my signature to check and make sure you're using the latest Mac client. After that, read and post to this thread: http://boards.cityofheroes.com/showthread.php?t=251072
Manga @ Triumph
"Meanwhile In The Halls Of Titan"...Titan Network Working To Save City Of Heroes
Save Paragon City! Efforts Coordination
CoH has been crashing on my mac and I get a fatal error message about a corrupt file, I have run verify all files, what is the solution to fix this problem? Other times when I crash I get a message saying assertion failed. Both crashes happen at least twice a day and are very annoying.