Some clips (.MPG) I've been playing around with after I raise saturation and contrast go grey, Because this did not happen to all the clips I thought it was due to the low processing power of my computer and after the rendering it would go away...instead they stayed grey.

I don't understand how some clips of same quality render just fine with the same modified saturation and contrast settings while others get the grey screen?

What could be happening?

Thanks in advance

I've experienced the same issue using "contrast" with HDV 1080i (mpeg2 - .m2t) clips, but I was using v0.8 svn from Sunab. It doesn't happen to me when I use 0.8 stable.
Ignazio