Does anyone have problems with Floworks and appearances?

This is very annoying. It routinely changes all objects in the model to a dull grey color,  the Flow simulation transparency function does not work correctly either leaving some assembly levels transparent after I change the transparency setting back to 0. In addition, some times it will leave the some assemblies solid and I have to go in and change the appearance on the items by hand.

I do not have this issue when working in solid works alone, only while using Flow Simulation.

I am running Windows XP Professional X64 on a Dell Precision T3400 workstation. I am using a NVIDIA Quadro FX 570 with the latest drivers.

Any help or suggestions would be greatly appreciated.

Grant