Deinterlace problem after Vista Update (1 Viewer)

[TMI]

TV-Server Version: RC3
MediaPortal Version: RC3
MediaPortal Skin: Xface
Windows Version: Vista 32
CPU Type: AMD+
HDD: Samsung 750 G
Memory:
Motherboard: Gygabyte
Video Card: ATI Radeon 3600 serie
Video Card Driver:
Sound Card:
Sound Card AC3:
Sound Card Driver:
1. TV Card: FloppyDTV-C
1. TV Card Type:
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: ATI
MPEG2 Audio Codec:
h.264 Video Codec: CoreAVC
Satelite/CableTV Provider: Ziggo
HTPC Case: OrigeAE S16T
Cooling:
Power Supply:
Remote:
TV:
TV - HTPC Connection:

After installing Vista Update KB957200 ( 28-10-2008) I had deinterlace problems with all useable Video decoders (ATI, Cyberlink, FFDshow) for TV exept the MPV decoder. I use ATI video multiplexer (for me the best result.
All the deinterlace settings I tried with several Video decoders had no effect.
So, I went back ( vista recovery procedure) to the system before the update and.. everything works perfect.

Is there anybody who has the same problem?

regards
TMI