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I had this exact problem. So, I checked each module by deactivating them one at a time and reloading that "user" page until I figured out which module was the culprit. Then, I went into the user options and turned off the option to display users' latest posts - that solved it. So, apparently, XOOPS was having an issue showing the latest posts from that specific module... which was Pageworks 1.0b. I think I can live without seeing who posted what last. I hope this helps someone!