Lightroom has been very buggy lately. I go to click on the adjustment brush and the program crashes and quits at times. I've also been getting lots of spinning beach balls, and when trying to adjust the white and black points when holding down the option key I've had the screen go black with all kinds of neon colors flash on the screen. Sometimes the picture breaks up completely and I get random squares showing parts of my photo in a disjointed array. Have tried rebuilding the preference files but the problem keeps recurring.I'm running Sierra on a Mac with the latest version of LR CC. Any help or ideas would be greatly appreciated.