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I did not know that you have XOOPS running on your local machine.
So loading XOOPS to a local machine is normally not a problem.
But some people have sometimes problems when uploading XOOPS to their website (But this has nothing to do with XOOPS).
It is curious that you get a blank page with the checkit.php.
The only XOOPS file which is included by that script is the mainfile.php.
Please take a look at the mainfile.php. Is the information within mainfile.php ok?
When you take a look at the blank page html source output, is there something (header?), or is it really empty?