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Two options:
1)First, check on another image VTI or ATV
or
2)Report an error personally Sundtek http://support.sundtek.com
I tested VTI 9.0.x image including latest updates yesterday and same issue occured.
Only difference is that I had to install the drivers with the Windows SundtekSettopboxInstaller. Installing the drivers manually like with OpenPLI didn't work.
Anyway I will go back to OpenPLI 4.0 because personally I don't like the VTI image.
I will get in touch with Sundtek for further troubleshooting. As mentioned in one of the previous posts they suspect a wrong buffer setting.