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First, try emptying the contents of the templates_c/ and cache/ directories.
Make sure that, when you upload a module, you upload it so that the xoop_version.php file is in the root of the module folder, like so...
%xoops-root-directory%/modules/%module-name%/xoops_version.php
You said everything seemed to be working well, so I'm assuming that you got your mainfile.php configuration correct. The only thing I can think of, of the top of my pointed head, is that you've got some outdated cache or an improperly uploaded module.
Hope this helps.
James
Insanity can be defined as "doing the same thing over and over and expecting different results."
Stupidity is not a crime. Therefore, you are free to go.