This is really a very unfamiliar problem for me. I just tried opening a couple of projects of mine, right after updating to the latest CC 2017 version. It opens up the project, waits for a couple of seconds, closes it and start reopening it. Infinitely. It makes no sense to me. I can't stop the process. If i hit cancel on the open dialog box, it stands still with no projects opened.
A couple of days ago it also started showing up the "Fresh layer cache checkout failed" bug (that's why I updated the app), wish was already frustrating, but now it is unusable. What's wrong with it?
I'm on an IMac OS X Yosemite
2,5 GHz Intel Core i5
12 GB 1333 MHz DDR3
AMD Radeon HD 6750M 512 MB
What version of Yosemite are you running?
Are you still facing this problem? If not, let us know how you solved it. If so, please let us know so we can assist you further.