This has never happened to me before. I booted up my MacBook as always and the cooling fan started up as soon as I logged in and was blowing pretty strong. It caught me off guard since, having just logged in, I had nothing processor-intensive running yet. I checked my Activity Monitor and it said that a process called "wrapper-macosx-u" was hovering between 95 and 98% CPU. I'd never heard of that before and presumed it was an anomaly as my CPU was never used that much when I first logged in. It didn't get in the way of running Photoshop and iTunes but eventually I got tired of the fan and worried it would overheat. When I restarted the computer I checked Activity Monitor again, expecting to see that process there but using less CPU...but it wasn't there at all. I'm at a complete loss. I have no idea what this process is or what it was doing hogging my CPU. If anyone has any ideas that'd be nice.