I think I have asked this before but did not receive an answer. Can anyone tell me why this is happening and how to fix it? The tabs and panels at the top of my screen get blacked out in blocks. Sometimes the entire banner is gone, sometimes just chunks. When I move my cursor over the space some of the pieces reappear, sometimes I have to click around to get it visible. The blackouts seem to be in rectangular chunks, like enormous pixels. And not the entire tab, fragments of the tabs and menus. Attached is a screen shot of my desktop.
I am using a cross-platform Mac desktop and working in Windows 7 using Autocad LT 2013. Two co-workers using the same program on PCs has the same issues so it is not my machine.
I hope someone has a solution because it is driving me distracted!