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Personally, I would dump your host before dumping xoops.
Not every host is setup up properly for dynamic sites.
There are more problems with misconfigured hosting services than there are with bad XOOPS modules.
From what I know of the history of AMS and the people behind it, its is a great XOOPS module, with many hours of testing behind it.
Hope that provides a better view of your issues.
I gurantee you if you use the right host, things will work better.
Best Regards,