Believe me, I know that this is probably the sh***iest of all possible solutions, but is it still possible for you to return your Mac Pro? We were literally a few days away from returning ours when the 10.9.4 update dropped. You only have a two week window to return the hardware, but we called up "Genius" tech support (*rolls eyes*) and yelled at them; they agreed to extend the grace period by a couple of weeks, so we could wait a little bit longer for a fix to be implemented. Our reasoning was basically "f**k you, if you can't make a product that actually works, then give me my money back"; the plan was to return the box, then re-purchase once the problem was actually fixed, or look into alternatives. Luckily (hah, "luckily"), we wound up not having to worry about it, but we were reeeealllly close...
Both Apple and Adobe don't seem to realize that there are other options out there; their customers seem frustratingly willing to put up with the piles of sh*t both companies are all too willing to serve up. It may not happen soon, but eventually people will walk away...