Problem:

I have just moved my hosts to a new server  but now all PHP scripts return blank page although they were working on old server without any problem.

Solution:

Our technicians have encountered the same problem lately and found that it may a problem between PHP 5 and Zend Optimizer 3. This problem affected to following version:

PHP 5.1.2
and
Zend Optimizer 3.2.8

We have switched to older version of Zend Optimizer (3.0.2) and it works.

Update: There is a conpflict between PHP 5.1.2 RPM package in SuSE 10.1 and Ioncube Loader or Zend Optimizer. If you face this problem, simply switch to PHP 5.2 or SuSE 10.2