Mike, since you've been so helpful and gracious in offering help, I forwarded your email address to my friend whose PSCC problems I reported in this thread previously.
I hope you can help him, here is his last report:
Hi Les,
I just wrote to Mike Chambers. Adobe hasn't responded in the promised 5 days with higher level assistance.
Within the past week yet another update was issued and it helped some people in the Adobe forums, but not me. I still have the program start, display the workscreen and disappear.
Hopefully Mike will have some ideas, but I'm wondering what's left to try. I think I've tried every suggestion the Adobe forums have mentioned.
Fortunately Lightroom works fine, and is proving to be the reliable workhorse it's always been. Photoshop is simply useless at this point.
As reported elsewhere, some of the principal PS designers moved over to LR. I wonder, .... nah, must be Windows.