I'd just like to add, since updating a couple of Mac Pro clients, running Mavericks 10.9.2 and Photoshop CC with the latest 6.3.8-2 Wacom Driver, early signs are that users have noted an improvement in performance of Photoshop CC.
Its quite early days yet, however shortcuts that had been slow to respond and we have had multiple app crashes in Photoshop CC when using multi-layed 16-Bit Tiffs, seem to be ironed out.
Also we have had to use the whitewindow plugin for photoshop too.
Sorry to crash in on an InDesign thread regarding Photoshop CC issues, however I have seen a lot of common ground for many folks issues with Adobe software being they are using a Wacom device of some sort.
Would be good to know if others have noted any improvements with this driver?
I am having the same problem with shift-constrain and the spacebar, but do not use Wacom products. Does anyone know of any other fixes?
It's almost always the system grabbing the shortcut (on a Mac look at System Preferences > Keyboard > Keyboard shortcuts), or a third-party product is. Lately, a lot of Chrome extensions cause problems. Try quitting out of your web browser.