Has anyone seen with yosemite running safari that the entire system "seems" to freeze up at times? I get a vertical mouse pointer (the I beam) when this occurs instead of an actual pointer but the system is otherwise motionless. The entire interface just sits as if nothing is happening, the system clock in the right hand corner freezes. However, the system is actually running in the background. I found this out by playing my guitar thru the system and sure enough it was working fine. If anyone else has encountered this and figured a fix I'd love to know it. I'm on the verge of shutting this thing down until they come up with the first update since this just isn't stable enough to use reliably.