I partitioned my HD and kept ML on one and mavericks on the other. Whenever I would use ML my mac felt VERY slow. I only installed ML after erasing my HD about a month before, so it was a recent clean install. I have now deleted ML, did another clean install of mavericks, and now on DP4 it feels BETTER than new, like a lot better than new. I too have an adobe issue, but I am using CS5 and get no errors, but it still deletes values and when I am trying to work fast, this is extremely annoying 