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I have the same problem on my site (hosted by an hosting service) and this morning I removed XOOPS 2.04 completely, I also removed all XOOPS tables in MySQL and installed XOOPS again. After new installation I still have the same problem. A new problem appeared as well: I can no longer login. user.php isn't working as well!
The strange thing is that till yesterday I didn't have a problem at all!.