THE PROBLEM:: After like 20 mins, I can't drag and drop on the dock (moving dock icons around), nor in iTunes (dragging songs to playlists etc). At first, I thought this was just happening in my DJ software (traktor pro 2), because after 5-20 mins of DJing I would go try to move a song around and nothing would happen. Then while I was watching tutorials for Ableton Live, and had Ableton Live running in the background, it happened again. And seeing as how it drag locks iTunes and Dock I think it's a Yosemite problem. Dragging folders and files on the desktop works perfectly fine though.. Any ideas what's causing this? Logging out and in temporarily fixes the problem. BACKGROUND:: Refurbished MBP Retina 15" 2013 pretty much maxed out. My Mac partition broke out of nowhere recently and I had to reinstall Mavericks and Yosemite again. The installing seemed to work fine, and I have pretty much the exact same programs, I'm not sure what could be causing this? Also have a Windows 8.1 partition as well as all 3 Paragon NTFS software installed.