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Have you added any new modules lately? Have you added new blocks to your pages? If yes, then slowly deconstruct what you built to find the error.
In some cases, but not all, when new module blocks are added to your site, they may cause blank pages; especially custom blocks that are coded incorrectly.
This is mearly a snippit of the many things that can cause blank pages. A thourough search of the forums and documentation will give you more insight on what to look for in order to correct the problem.
Feel free to continue posting your workarounds and attempts so that we can all try to get you through the white pages issue.
XOOPS Community Support