My mouse seems to have died somehow.
When I reconnect it that works fine, so it's still communicating with the wireless receiver -- but the cursor on my screen won't move. This is really bothersome because I use my mouse ALL THE TIME for everything. For the most part I'll be able to tolerate using a backup or the trackpad, but this could seriously hinder my reviews.
I've been meaning to get a nice wired gaming mouse but I had been hoping to wait until, you know, I could afford it.
EDIT: I fixed it! It was actually just a weird driver issue. Problem solved.