Lightroom :: 4.2 Adjustment Brushes Aren't Working?

When I go to use my adjustment brushes, I would select the one I wanted to use and then go try to use it.  As soon as I first let go of my mouse, the brush would change to custom.  Since updating to 4.2, that has stopped switching, but my brushes still don't work. I have tried multiple brushes and it's all of them, not just one particular one.  I have tried restoring my presets, that didn't work. I have tried deleting all of the presets from the folder, restarting Lightroom and re-importing them, that didn't work. I updated Lightroom, that didn't work.  I have restarted my computer and that didn't work.  The thing is, is that they HAVE worked before.  I was switching between some catalogs and once I was done with that, they stopped working.  So I'm not sure if I did something while switching between catalogs or not.  I use these brushes all the time and they are a significant part of my workflow!