Copied directly from my Mambo Info Page:

WebServer to PHP interface:  cgi

I meant PHP on CGI mode. The original version used a lot of preg_match() which is unnecessary. It caused error on CGI mode servers because it's parsing a long string.

The new file fixed the Error 500 message. The Mambo Admin is now accessable and all is green and OK. How did you find that? Did the access help? Do you need further access?

FYI - Logging into the admin page of SMF (Administration Center) and viewing the version info, it still reads 'SMF 1.0.0 for Mambo' even though when I go to details, the rest still reads as:

SMF File Your Version Current Version
SMF Package SMF 1.0.0 for Mambo SMF 1.0.3
Sources 1.0.3 1.0.3
Default Templates 1.0.3 1.0.3
Language Files 1.0.1 1.0.1

Clearly this is a minor problem as the forum itself and the Mambo admin page now work.

Does this have anything to do with why SEF may not work properly?

Thanks for all your help & get some sleep,
ddonzal

Where in Mambo do you see that info

Using Mambo 4.5.2
I don't have any System Info anywhere, do I need to enable it somewhere.

What is your version of Mambo

Click "Help" and the link is on the upper-right side.