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Hi,
I don't have experience to the particular themes you're talking about, but I can only imagine that the bug lies with the theme and not with Xoops. I say this becuase if some themes work, and others don't the templating system seems to be intact.
I know when I create a theme myself, a small piece of misplaced PHP code, or a syntax error can result in a blank page, so maybe this is the case with the themes you've tried to import.
Also be sure that the theme's you're using are XOOPS 2 compatible, because if they were designed for 1.3 there are some fundamental differences that will cause issues.
Regards,
Gareth