Does it do this w/ Real View on or off? Typically this is a RAM &/or Video issue and we always just didn't put in any materials if we could help it. It is strange that aluminum isn't a problem but the plastic is. If this is w/ Real View, and the part is partially transparent, then it's your video card. You could look up on SW website and see if you have the latest drivers for your video card .. this may also be an issue.
JerryFlyGuy
The more I know... the more I realize I don't
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)