I have ongoing problems with FirePro V4900 and Draftsight.
When I pan the display using middle mouse button, the display loses pixels - ie lines turn to dotted lines with pixels changed to background colour. If I pan using scroll bars, then the display updates correctly.
This has existed throught several revisions of FirePro drivers and Draftsight updates.
If I zoom out/in and back again, the display is restored. Any ideas to any settings that may fix this?