We have deployed Dynamics-NAV version 4.3 at a client site where the bulk of there desktop machines are split into two makes, Dell and HP. I seem to have an issue on the Dell machines, where the Navision forms seem to flick occasionaly. It almost looks like a currform.update. I have increased the object cache setting through tool > settings to 256,000 to see if that has any complication, but with no joy.
Has anybody come across an issue like this before, the machines are Dell Optiplex GX745.
Maybe an issue with the GPU, can you try sticking another card in the machine, and see if you get the same problem? If you do I would RTB the base units.
I think it reasonable to expect that different hardware would refresh screen differently. I am sure you will find a setting somewhere to change it, but its probably going to be a long hunt.