Apple MacBook Pro Retina, OS X 10.10 Yosemite Beta 1
I've just downloaded Photoshop CC 2014 Trial. I don't use mouse or tablet, but I use Apple Trackpad. When I start using Brush, Clone Stamp, Quick Selection Tool, etc cursor freezes between movements. In previous version of PS (14.2.1) everything is fine. I've made a video to show you this problem.
What should I do to solve this problem?
P.S. Sorry for my English.
I've ran into exactly the same issue, Photoshop CC 2014 reacts fine with regular cable mouse, but when I use Apple's Magic Mouse it gets stuck exactly like on the video from the OP.
Please let Apple know about these issues so they can be fixed before Apple release MacOS 10.10.
I've just reverted back to the previous build of Photoshop CC and the problem is fixed, so I'm gonna wait till the next release of Photoshop or the final version of Yosemite and give it another shot. My friend tested the same Ps version on his iMac running Mavericks and it worked fine with the Magic Mouse, so it's definitely some kind of incompatibility issue between the current Ps CC build and Yosemite.