Plesk webmail showing blank page

Sometimes on plesk servers http://webmail.domainname.com may give you a blank page. This usually occurs after upgrading the PHP to php 5. This is due to a bug in the version 5.2.5 of PHP that affects the functioning of Horde which is installed by default with the Plesk control panel 8.1.x or 8.2.x. Read more…