I am new to Sony Vegas and got it last Friday and need help with something. Every time I use a Media Generated Noise Texture, in the preview window it looks like there is lines going through it. Video here -
On my System # 2 ( intel HD4000 GPU), I can reproduce the lines in Vegas Pro 12 and 13 with GPU on in Options / Preferences / GPU acceleration of video processing:
With GPU acceleration off the effect is smooth.
My System # 1 (NVidia GTS 450) works as advertised.