Uncapped FPS no longer working

So, ever since the experimental uncapped FPS option was put into MCC PC I’ve always had the option selected and would get my monitor’s max 180 FPS in everything except Halo 2 with anniversary graphics on and Halo 4. Lately when playing any of the games in MCC though, I notice the FPS counter only going to 60. The uncapped FPS option is still selected in the graphics menu, so I don’t know why suddenly I’m getting capped at 60. Has this happened to anyone else?