i am using the phex version for mac os x (10.1.5) and everytime i open the application it opens and then automatically shuts back down. The user screen pops up but other than that i dont know what the hell happens. If anyone can help me that would be great. Thanks.

It's an easy fix. Like other java and unix programs, MacPhex stores it's preferences in a hidden folder called .phex inside your home folder / directory. At the terminal type: "cd" (to make sure in your home directory) and then "rm -R .phex" (removes both directory and files with out any prompts).
That should clean you up; Using "ls -a" you can check to see if it's gone.