During the lengthy period of testing, it was determined that a few large changes had to take place in the handling of depth buffering to fix issues with GeForce 3,4 and newer ATI Radeon cards, so if you had to use "Force Depth Compare" or "Force Depth Enable" to use the plugin in the past, chances are that will no longer fix things in 1.5, it was a give and take scenario, updating drivers might help