PX-116A can't play CSS discs?

Not sure what the problem is here but out of my 3 DVD drives (Nec 4571/3500) only my PX-116A DVD-ROM won’t playback CSS encrypted DVD’s in POWERDVD 7, they play fine in Windows Media Player but not POWERDVD 7? I even installed the 2211a update for POWERDVD 7 but it made no difference.

If i use AnyDVD then the discs play fine, disable AnyDVD and the discs don’t play anymore, so it looks like something in POWERDVD 7 is blocking CSS descrambling from the PX-116A unless AnyDVD is used.

Any ideas as to what the problem may be please.