[AAlchemy]

I get a black screen with only audio on any AVC encoded video when hardware acceleration is enabled. (video plays fine if set to software decoder)
I have tried a MOV and MKV containers, in 1080p and 720p.

VDPAU works fine with mplayer on any file I have tested so far (log showing ffh264vdpau http://paste.ubuntu.com/1450082/ )

distro: Ubuntu 12.10 x86_64
kernel: x86_64 3.7.0-5-generic
video card: NVIDIA GeForce GTX 570
video driver: nvidia 313.09-0ubuntu1~xedgers~quantal1
Install method: PPA
XBMC Version: 12.0-RC1 Git:49b2d1f

nvidia-settings -q all http://paste.ubuntu.com/1450037/
vdpauinfo http://paste.ubuntu.com/1450035/
mediainfo http://paste.ubuntu.com/1450032/
xbmc.log http://paste.ubuntu.com/1450029/ (this log was after a clean start. deleted $HOME/.xbmc )

[FernetMenta]

Do you get a picture when only one monitor is connected?

Or try this version: http://forum.xbmc.org/showthread.php?tid=116996
Should be fixed there.

[AAlchemy]

Hmm, same issue with one monitor.
I'll try the suggested version next.

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That version did the trick! thanks