I discovered that so far Photoshop CS6 and Photoshop CC both are not working in OS X 10.10, mainly because "Open" and "Save As" dialogs are completely broken.
Some may argue that OS X 10.10 is in beta and that's not 'supported', still after few months of using, with over 100 apps, there are only two that fail completly, Microsoft Lync which is notorious for needing a patch every couple of weeks and Adobe Photoshop.
I am wondering if others had the same problem, if there is any workaround (don't ask me to run a VM or another OS...)