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Well, I just did the same thing. Added themes directories to Themes in the root. They appeared in the theme selections under Admin>System>Preferences. Chose one. Went to index.php and got a blank page. Immediately went back to the Admin page was able to change back to default, went back to index.php and everything fine. Shut down the computer came back a few hours later and can not now see the XOOPS site, admin page, etc. I'm stuck!