So, I've been working on a photo using a number of adjustment brushes and now, all of a sudden, if I try to add another brush stroke in an adjustment I've already been working on, Lightroom reverts my image back to the default and removes all the brushes. If I CTRL+Z, the image and pins for my adjustment brushes return no problem. I have never experienced this before. I've tried deleting the preferences file and that didn't work. I can work on other photos no problem, but this one that I'm talking about, seems broken. I've put a lot of time into this image and don't want to start from scratch.