I have upgraded to LR 5.7. Suddenly I can't see the circle and central round button when I drag an area for Radial Filter. I also can't see the starting round button when I try to use Adjustment Brush.
My system is OS X Yosemite Version 10.10.1, MacBook Pro (Retina, 15-inch, Early 2013), 2.7 GHz Intel Core i7, 16 GB 1600 MHz DDR3, Intel HD Graphics 4000 1024 MB
Try pressing "H" for show/hide pins. Will turn it on or off.
Great! Thanks BKKDon.