Hi guys, Yosemite GM candidate 3 here. I've just downloaded the definite version from the MAS. Tried to install it and after a couple of minutes the following error appears: "the core storage operation is not allowed on a sparse logical volume group". It happened twice so I am not going for a third one. I'm a bit confused, no partitions in my HD, only using parallels (don't know whether this could be any relevant or not). Any one has seen this? Thanks for your help; much appreciated.