Just updated to Illustrator 16.2.1 and discovered a bug I didn't have last week. This is reproducible even over a restart. What I'm doing: opening two documents and moving one to a second monitor to compare the layouts. MacBook Pro 2.4GHz Core i9 Radeon Pro 560X 4GB, Intel UHD Graphics 630 1536MB. When I move a window to the second monitor (the Intel card), the display first is very large (one page, as opposed to spread view). Then as soon as I scroll, the content rendering gets corrupted. It might be totally upside down; or it might smear during scroll. Scrolling top to bottom smudges; scrolling bottom to top resets. It doesn't make a difference if the window is the main work window or a separate one. Happens even with a new document and placeholder text.