White pages often point to (similar to 403) to either a coding issue or a styling issue. Something does upset the working.
Best to check is calling the page source and look if it loads up to a certain point (at end there the issue starts) OR does not show anything at all.
If nothing is there, you will need to check the theme/template in use. Hard to tell what exactly does it. Some small changes made (manual enhancements et can have an influencec..). A div, ; etc..language related....