Just noticed a new beta version has been posted for D2X dated 20/3/2009 on their website.
Beta Version 6.12.8.1764
Description Xonar D2X Windows Vista32/64bit driver
1. Fix BSOD issue when running the Dxdiag application.
2. Fix the wrong 5.1 Channel audio output in Red Albert III.
3. Fix Swedish issue.
4. Fix the issue that when you minimize UI into taskbar, you cannot reopen the UI from quick start.
5. Fix the issue that the VovalEX(ChatEX and Magic voice) may not work in MSN.
6. Fix the issue that Winmp may has no sound when enable GX function.
7. Fix the issue that ASIO may fail in Steinberg Sequel 2.
8. Fix the issue that when the VocalFX\Magic Voice function is enable, Magic Voice function is still working after the call end.
9. Fix the DDL+SVN full issue.
10. Fix the BSOD issue when playing WoW.