Please, if possible do check the issue im describing with Illu CS6 in Yosemite. It would be great if you do not have it, id like to know about it and solve it on my Mac because its driving me crazy!I never had any issues in Yosemite or El Capitan with Illustrator. I had nothing like the problem you describe in the other thread. I can check tomorrow to be sure but I opened an Illustrator CS6 file and drilled down through the various folders and each column scrolled over ending with a brief preview. I don't remember anything being cut off and I would have noticed.
To be honest I had very little issues with Yosemite or El Capitan and any minor issues were fixed in updates. Now Sierra.... that has been an ongoing adventure.