Do you have error reporting turned ON....white page can throw out for many reasons but first you shoud turn on error reporting on,also when posting issues it is recommended to post as many information you can..like PHP version,OS,control panel(if use any).If PHP errors reporting is off you'll get white page for any error...this ofcourse is not white page..there is error just you can see it.But if you have error reporting is ON and you still get white page than in most case it is rellated to PHP max_execution time(90 minimal for priduction),PHP script_max_memory(min for blesta is recom. 128mb)...it ca be also related to PHP version..ion cube version..ofcourse those are only most common problems but it can be related to many other things.But first make sure error reporting is ON...