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Hiya, welcome to Xoops.
Most white pages happen when something bad has happened, and normally with php you get a clue to what is going on with an error message, but since error messages can sometimes be annoying, we turn them off from the admin. You don want a horrible 100 lines of error code on a production page right? Anyway, under certain circumstances we need to turn them back and this is a time I think :)
Turn on php debugging and try again, copy and paste any error messages you find back here and someone will be able to help you.
Also, please post any information regarding:
php version, MySQL version, server software version and of course XOOPS Version.
Thanks