Well, it took almost an hour to update, but after it finished, I tried out several different BDs with my player outputting 24p, and it worked flawlessly!
Last night, I was angrily and sadly checking out accessories4less' return policies, and also looking at BD players with two HDMI outputs to try to fix this. I was in a bad spot.
Fortunately all is well now, but unfortunately I have to go run some errands and pay some bills.
After that, it's party time!