Loss of Resolution
So far, my only gripe about MacOS 9.1 is that my second monitor (a badass Sony 15-inch) now can’t do the resolution I used to run it at (1152×870).. which sucks. The monitors control panel will let me set it to 1920×1080 at 60hz (which it can actually do, which is amazing for a 15-inch), but not my preferred resolution. But I’ll give that up for a stable OS.