Blank pages simply mean errors occur and aren't being displayed.
One option is to try turning on error reporting and that can possibly lead you to the solution.
Add this to the top of one of the blank pages:
and then browse it again. It could then give you an error message and line number that would lead you to the cause and solution.
If you post a URL to the page and FTP information so I can access the files I can help you debug and inform you of the cause as well, but that would be the first thing that I would do.