Joomla! has released version 1.5.16 of it's content management system (CMS). It is a security release and users should upgrade immediately. The Joomla! 1.5.16 release notification is found here.

HelTech customers that are subscribing to the update service have had their installations updated. The mentioned problem about PHP versions prior to 5.2 does not affect HelTech customers as our servers are running PHP versions later than that.