I just did a fresh install, deleted previous yosemite partition, and now as I'm installing a few apps, so far Dropbox and YNAB, when I try to move the app window it starts moving all across the screen horizontally, then starts moving down and to the right slowly regardless of where I'm actually trying to move the window. After clicking and trying to move it a few times, it eventually does it right and smoothly. So far only happens on 3rd party apps and yes I've reported the issues about 5 minutes ago.