XenForo 1.2.5 is a maintenance release in the 1.2 series and focuses on bug fixes and stability improvements. We recommend that all customers running a previous version of 1.2 upgrade when possible. If you are currently running XenForo 1.0 or 1.1, we also recommend upgrading to 1.2 when possible, but please be aware that this is a significant upgrade and you'll need to be aware of add-on and style compatibility changes.
The bugs fixed in this release include:
Fix the positioning of SWFUpload over top of the upload button.
Fix an issue with Firefox 27 not redisplaying images in the lightbox correctly.
Fix an issue on certain servers where duplicate session IDs were generated, triggering an error.
Fix "v" being stripped from usernames...