The "WordPress White Screen of Death" can have many reasons. The best option is to check your server's error log. If you find an error message like “Fatal error: Allowed memory size of [xyz] bytes exhausted ...” it is very likely that your server’s PHP memory limit is very low, propably 32 or 64 MB. The default is 128 MB. To increase the memory limit to 128 MB, put this line of code in your wp-config.php file.
If you do not know what your memory limit is, check your webhoster’s PHP info page or create one for yourself and search for “memory_limit”. If this does not fix it, please contact the support.