If you get a corrupt or expired error or blank pages check the following.
After checking all these and reuploading if the script still does not work redownload and upload again.
Other possible causes:
This shouldn’t be relevant, but try updating to the latest Loaders. Again this shouldn’t matter as ioncube test for compatibility, but try removing Zend Optimiser. It generally has a negative effect on performance, and so unless you really need it, it’s best to leave it out.
Loaders can be found at http://www.ioncube.com/loaders.php
IonCube Support can be found at http://support.ioncube.com/index.php?department=3
IonCube Forums can be found at http://forum.ioncube.com/