That's a fair point, I agree it seems most likely that it is a permissions issue related to the installaton/configuration of the WWGM.
I mentioned it becuase the "click OK to terminate" error is a common Catia issue caused by problems with the bits of code that integrate with Catia - ie the WWGM Abstraction DLL's and the Graphics Driver dll's.
Thinking about it futher my money would probably be on the fact that the Administrator user has written some WWGM config files/settings/dll's that Catia can't access as a non-priviledged user and this is hence why it works as Admin by but not as a normal user.
Now, I know for sure that we have no problems with running Catia and the WWGM integration as a non-priviledged user, so you have done something wrong with the setup/config somewhere... I think that you must go back to basics and start from fresh again (ie fresh machine), making sure that you are following the instructions exactly per the docs because you should not be seeing this.
Rgds
Gary