Pardon any redundancy I want a baseline...
So, you have a COMPLETELY BLANK page:
and you have no php error messages...
I don't think it's IIS related, BTW.
It could be permissions though...
assuming you have a handle on that.
And you deleted EVERYTHING in templates_c?
Re-up the (orig)common.php that you edited, a single syntax error can huck it all up...
Another thing, if you delete the templates_c and try to browse to the root, XOOPS should create new files in templates_c. Is this happening, and what gets created there?
I see you mentioned enabled debugging in the db... did you mean this (below)?
if so what PHP errors are being thrown.
try this:
If you can not log in to XOOPS set debug options, you can set it in your database:
Setting XOOPS debug in the database:
In any dB access tool (phpMyAdmin, etc.) open the table: [xoops_config]
In Column [conf_name] find the row:
[debug_mode]
Set the [conf_value] in the [debug_mode] row to one of the numeric values below:
0 No debugging
1 PHP debug
2 MySql/Blocks debug
3 Smarty Templates Debug.
Try PHP debug first... that may generate more info to go on.