Although it's not exactly according to the published release timetable, as we are still delayed by redirecting all resources available to prepare vBulletin 4.0 for its debut, vBulletin 3.8.4 is a maintenance version, which rounds up some usability related bugs, as well as address the problems for servers running PHP 5.3.0. 3.8.4 also addresses an issue with vbchop() causing PHP memory to hit memory_limit with very very very long posts filled with special entities on some non-standard configurations.
Issues resolved by 3.8.4 include the following:
* PHP 5.3.0 Depracated messages 
* PHP 5.3 Timezone Bug 
* Plus Characters in Email Addresses 
* Infractions and Infraction Points not showing correctly on "Search for Users" 
* Invalid URL falsely returned 
A complete list of the issues resolved by 3.8.4 is available in the Project Tools.
Upgrading from Previous Versions
3.8.4 is a maintenance release. We recommend that all customers running prior versions of vBulletin 3.8 upgrade to benefit from bug fixes and stability improvements.
Full instructions for upgrading vBulletin are available here.
PHP and MySQL Requirements
Please note that vBulletin 3.8.x requires at least PHP 4.3.3 and MySQL 4.0.16 or later.
However, we recommend that vBulletin 3.8.x is run on PHP 5.2.9 with APC (or a similar opcode cache) and MySQL 5.1.32 for best performance and stability.
Download vBulletin 3.8.4
As usual, vBulletin 3.8.4 is available for all customers with valid, active licenses to download from the vBulletin Members' Area.
vBulletin Members Area