green screen intel VAAPI

Hello,

i'm french, and i'm new consumer with XBMC.
I'have this Hardware:
- MoBo: Asrock H61M-itx
- Ram: 2x4G corsair 1033
- DD extern western digital ellement USB2
- CPU: intel G645 pentium 2.9Ghz dualcore.

Software: Openelec 3.0

My problem is, when i activ VAAPI(hardware acceleration intel) i have a green screen if i start a video HD(Mkv, X264....). With SD source no problem.
If i disabel VAAPI, it's OK.

Wath is the solution? Wath is this problem?

Thanks

Charly