Attached is a modified file for the ag_UnitFrames addon I adjusted to fix the major error everyone has been getting with 3.3.3 today from a depreciated function with the patch.
This is by no means a permanent fix, but it will stop the errors and keep the functionality till the addon is officially updated.
Download and copy this into your ag_UnitFrames folder in your addons directory.
If you are already running WoW, just copy this new file in and reload your UI for it to take effect.
See this post:
http://forum.twilightonalex.com/index.php?topic=8810.msg58640#msg58640 (http://forum.twilightonalex.com/index.php?topic=8810.msg58640#msg58640)