Anyone else been encountering UI freezes in Mavericks? I had been having something similar in ML, but only while using Parallels. I always figured it was something to do with that software. Now, though, it's been hitting me outside of it, when Parallels isn't even running. Last night I tried dragging an image out of Safari and into an instant messaging client, and got a complete, unrecoverable UI crash. I had to reset my iMac with the power button. The mouse cursor was still active - I could move it around, but not click anything. Music continued to play, and after the reset there was no indication in my Console that anything went wrong. Having it happen with Parallels was bad enough, but now that it's happening on OS X alone? It's a serious problem, limiting my max uptime on the device to around a week. I know it's not supposed to be this way, and I would really appreciate some help. Has anyone else seen this?