There's a "Use RGB mode" option in DVD - codecs section in current SVN builds. That should fix remaining DVD menu navigation issues. Don't use it if you don't have any issues with menus.
DVD Navigation "solved" with today's build 16-APR-
confirming the option present on the dvd codec section "RGB for menu issues". It worked for me using my NVIDIA video codec + the use RGB option allows me navigation in recorded dvd's
RGB hack is removed, use following instead of it -> "Turn off DXVA (use this option if you have DVD navigation issues)". This can be found under config -> DVD codec
as per your request:
Area: Media Portal Program
MP Version: 0.2.0.0 RC3$CVS-18.04.2006
Skin: MCE
Windows Version: Windows XP SP2
CPU Type: Intel P4 2.4Ghz
Memory: 1GB DDR
Motherboard Chipset: AsRock P4I45D
Video Card: Nvidia Geforce4 MX 440 64MB
Video Card Driver: nvidia 8.4.2.1
Video Card Resolution: 1024.768
Video Render Type: VMR9
Video Codec Type & Version: NVIDIA Video Decoder
Audio Codec Type & Version: NVIDIA Audio Decoder
TV Card: Hauppage 500 MCE
TV Card Type: hardware
TV Card Driver: n/a