Hey, I've been helping my grandfather set up his new iMac (the brand new line with all the new software and OS). My knowledge is basic when it comes to Macs, but I do know how to drag shortcuts to the dock bar. For some reason they end up disappearing after a while. Is it possible this is something the new OS upgrade is doing? I also know that the icons on the dock are wiped out when you drag them out of the dock, and my grandfather has a slight case of Parkinson's, so I also suspect it might just be his doing, but I wanted to confirm whether there were a few bugs with the new OS or not. Thanks.