I find thing like that happen when you first start CC 2017. CC 2017 displays it UI before Photoshop is prepared for use. When you open menus like the File menu there are Items grayed out unavailable the should be available. I find if I close and reopen the file menu perhaps more than once that Photoshop is then fully initializes and is ready for work. Photoshop startup sequence is not a thing of beauty. Sometime Photoshop UI does not even get focus and shortcuts do not work to you get Photoshop to get system focus. CC 2014 startup is better.
Okay, thanks. I'll just install the 2014 version, I've heard 2015+ versions has all sorts of problems like this tbh.