It worked! Alt+UPARROW, for future reference!
Hey, thanks! I, uh, didn't know I had switched it. Huh. Where do I switch it back from? I don't see anything in the options unless I'm not looking closely enough.
I installed advanced target priorities, and it works fine in terms of functionality, but the actual clickable window of the thing is 99% offscreen; only a sliver of the side shows up in my UI.
Any idea why that's the case, and what I can do about it? Thanks in advance.