All i can suggest really is to download another version or compile it, or delete the preferences. There are precompiled binaries in the parent board of this thread. Try one of those till it works. If another one also freezes, go to your home folder/Library/Application Support/aMule/ and delete amule.conf. It could help, you never know.
If you want someone to tell you whats wrong... You probably have to provide a little bit more information as to which version you downloaded... and what kind of error its spitting out in a debugger.
