dvd subtitles with windows vista and overlay mixer..

[guardian24]

Is there some known issue with dvd subtitles in windows vista? When i used XP dvd subtitles worked just fine but now I cant see those (i can sure select them from subtitle menu.) When i use example power dvd i can see dvd subtitles, but i have this problem with DVBViewer. The funny thing is that dvb and teletext subtitles works like a dream. Is there any difference what render i m using? Now i use unchanged, also tried overlay. VMR7 & 9 renderers i cant use because those gives me a blue screen (because of driver problems of ati hd2600 adapter.)