i try to save the wpmu templates when - apperance - active

Hi i try to save the wpmu templates when - apperance - active tepmlate click customize - and then no matter what im set or write the fileds there are only blank white page at right side, and when im click on save nothing happens. It is exspecially make me angry becuse i can set the menu to the header and othe stuffs too.

What can be the problem ? I tryied several templates from here and always the same problem.