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I got the same message. I guess for them "optimized" means working...
I've lost features in PD9 and Yosemite. My c: drive no longer mounts under "/Volumes" in MacOS. This is a serious problem for me as I have Mac...
I'm having this exact problem with Parallels 9 (latest) and the release of Yosemite. I refuse to pay $50 to make this thing work AS IT USED TO!...