To all that is interested,
Nebula have comfirmed at DigiTv has a problem with ATI Drivers.
Here's the reply from my Email:
Thank you for your emails.
We have investigated further and it looks as though with ATI cards, changing the picture settings in DigiTV does affect the settings in the ATI overlay tab, however, other graphics cards are not affected in this way, ie, they remain the same even though hue, contrast, saturation, etc are changed within DigiTV.
With regards to the Gamma setting, again, DigiTV should not be making a change to these settings and is not able to since DigiTV can only alter the picture settings in our Picture Controls window, ie, Brightness, Contrast, Hue, Saturation and Sharpness. As such, the problem with the Gamma setting will probably lie with the graphics card drivers you have installed. You say that you've already tried upgrading only to find them "buggy", however, an upgrade may help to resolve your current problem.
Thanks again for your emails and I hope this information helps.
Best Regards
The Support Team
Nebula Electronics Ltd
If some of you are having problems with dark images with regards to DigiTv
Let me Know
Sparkie