Today, we are pleased to release XenForo 1.5.5. This release fixes a number of bugs and issues that were found since the release of 1.5.4. As this is a maintenance release, the vast majority of the focus was an increase in stability.
Please note that we are now formally recommending that you upgrade to PHP 5.4 or newer. Our intention with XenForo 2.0 is to require PHP 5.4 or newer. If you are running PHP 5.3 or 5.2, you will receive a warning when installing or upgrading XenForo.
Some of the bugs fixed in 1.5.5 include:
Fix an issue where logging in via Facebook would immediately log you out again
Prevent a database error when using the IP Board 4.0/4.1 importer with a IPB 4.1 database
Resolve a timeout when dealing with long data...