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No, as I stated above I do not. Plus I noticed that you are using version 2.1.1 on your site. This is a development version, and I believe the way users are handled has changed some, due to the extended profiles module included. So in fact this could be a problem with the XOOPS beta. But I will let a developer answer that.
As stated with the 2.1.1 release, it should not be used on production sites, unless you want to test it. But as with all betas it is best to test on a non production site as some bugs may cause data and functionality loss. Better to use the stable 2.0.10 on production sites, and 2.1.1 on a test site.