I enter projection master and use the directional brush with the a alpha circle. Then when I pick up from projection master and enter projection master again, the directional brush does not work anymore with any alpha. It only works once, thats it. Nothing else seemes to make it function again, no matter what work around you do, it does not respond again. I doubt anyone knows whats wrong with it. Sometimes it crashes in projection master when you drag the alpha off the model. This is one of the main features of zbrush but a big disappointment.