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Are you able to go through the admin back end, if so then turn on debug:
Admin ---> system module ---> preferences ---> General Settings
Then enable the Debug Mode (inline)
And go to the page which is blank and see if there are any errors?
What version of XOOPS are you running, could your host of made any changes to your services without you knowing, and what modules do you currently run, as there could be a conflict?
Kind Regards.
Tom
http://bassmanthemes.com
http://www.xoopslance.com