I tested the public betas of OS X 10.10 (Yosemite) and they seemed okay, so I installed the real thing at the end of last week. So far I haven’t had any problems with applications. As usual, my local web server set-up got stomped flat, but I’m used to that by now. That’s why I make backups.
I’ll install OS X 10.10 (Yosemite) when it’s released, but it would be handy to know what works and doesn’t beforehand. To test it out safely I downloaded the OS X 10.10 beta and installed it on an external drive. I allowed the installation process to migrate applications, settings and documents from the main drive, so I have the same set-up as before, but an upgraded OS. I don’t have time to test everything, but here’s what I found so far. (Please note this is an idiosyncratic list, as it reflects my illustration, web development and 3D work.)