Joomla 3.3 that was released a couple of days ago, presented a problem with the login/session function of Guru.
The good news: we have a fix for this issue, so please upgrade your Guru to version 3.1.6 ASAP to avoid this issue. Even if you don't plan to upgrade to Joomla 3.3, your site may get upgraded without your knowledge, when you attempt to upgrade to 3.2.4 because of a bug in Joomla, see image below.
So, it's just a good idea to upgrade to the new Guru anyway :-)
What about other iJoomla extensions?
This Joomla 3.3 conflict also appeared with: JomSocial, Ad Agency and Publisher. All products now have a new version with a fix.
What about Joomla 2.5?
This doesn't apply to you if you're still using Joomla 2.5.
How to upgrade: