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All of the modules seem to be listed.
Since I have been trying every trick in the book for the last couple of hours and desperately searching for any reference to my problem, I have come short.
It seems no one else had this problem with an existing site, just with new installations.
Whew...I have managed to make the modules reappear in the admin area so far by removing the cache/. I can now access the modules with the serious exception of the system module!
When I press the system module, I get an error 500 page!!
So now the issue is getting the system module to work.
HELP PLEASE