wow, Allan's help totally helped fix my issue.
thanks dude, I spent all day trying to fix the issue although I sort of created the problem.
I ghosted the hard disk of my BE exchange server onto a bigger hard disk and after starting up the server, everything worked fine except for OWA and I got the OWA Loading... issue.
After copying the latest exchweb folder over from the BE to the FE server, it worked again!