I bet this is probably an issue with my PC, but I have a really odd error with ArcGIS lately.
Refer to the image, it'll explain it best:

Notice how their no map displayed? No matter what I do I can't get it to display. If I add data, change the basemap, restart my computer, re-installed Explorer. This started happening about a week ago for no apparent reason. Nothing had crashed or changed recently on my PC.
Has anyone ever heard of any bugs that might be the cause of this?
My ArcGIS Explorer build is: 1750 (2.0.0.1750)
Any help would be greatly appreciated.