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I'm having the same issue, so I removed the last mod I installed - marquee. It then showed up in the uninstalled list, but no others.
Then I uninstalled one of the new profiles mods - it uninstalled and disappeared, still only the maruqee module is showing.
I turned on debugging and got no errors. When I view the modules page in admin, and view source, it's missing the bottom of the page code, it ends at:
<br />
<table width='100%' border='0' class='outer' cellpadding='4' cellspacing='1'>
<tr align='center'><th>Module</th><th>Version</th><th>Action</th></tr>
and that's the end of the source code for the page.