Illustrator doesn't display the proper/selected file. For example, if I have file A open, and I open file B, it will either show as blank or will display file A. When I detach file B from the tab bar, file B displays correctly. When I reattach file B to the tab bar it is either blank or displays file A again, even though file B (0r C or D, etc.) is selected.

These files all displayed and functioned properly before upgrading.

Attached are my basic computer specs.