Apps stop working after updating to 2014.1 - only in one account.

Question

I updated to 2014.1 and Photoshop will open, but will not respond to mouse or keyboard input and has to be force closed. Photoshop CC still works fine.
After previous experience with the Update Manager, all updates were installed under the Administrator account.
Back in the regular user account (is also an Admin account) Premiere started getting slower to open, then stopped altogether with the "could not detect video playback device" error. Updating drivers, both for Nvidia graphics and Intel graphics (laptop) made no difference.
Both programs work fine in other accounts - both the Administrator account and a newly created test account.
Preferences were synced online to the Administrator account and then, when not all of them came back, they were manually copied from the nonworking user account. Premiere continues to work in the Administrator account.
I really need this to work in my normal user account - I have other applications that will have to be re-authorized and preferences restored, as well as all of the Adobe CC preferences and presets as Cloud sync doesn't really work fully.
Any suggestion for possible courses of action would be greatly appreciated. I'm off for a couple of weeks so I'll try and get this fixed, otherwise I'll get a new HDD and do a clean install.
Joe

Answer 1

Sorry, thought I'd mentioned that - all accounts have Admin privileges, although all installs and updates are always done through the actual Administrator account.
Although I've decided to start the year with a fresh install on a new SSD, I'd kind of like to figure this out.
I have since:
Created a new user account.
Premiere and Photoshop run fine.
Copy everything from the Old User folder except the ntuser.* files that are the common culprit on corrupt user accounts - although there have been no other indications of that.
Premiere and Photoshop fail in the same way as before.
Create a new user account.
Copy everything not Adobe in the User folders.
New user account now behaves (mostly) like the old user account but Premiere and Photoshop work.
Incidentally, even though I verified that it was checked, Syncing user settings with the Cloud does not restore my saved workspaces. It does restore effects presets.