Worst Adobe update ever for me. (I'm on Windows 8.1) I should have stopped trying after it continually failed to install, but I didn't. And I really didn't want to call them on the first day and be experimented on. After lots of dead ends chasing error codes, I ended up uninstalling and reinstalling. I thought that worked, but I had no dehaze tool, it was gone. I tried reinstalling again and the haze tool came back. Then I found I could only run Lightoom once, then it would never open again. Signing in and out did not help, but a reboot did. After some snooping, I found LR was still active in task manger even after exiting. Just for giggles, I tried unchecking the show add pictures box mentioned in the article above. It worked, so evidently its causing problems on windows as well. I can open and close LR all I want now.
A new problem though, the Lightroom preferences window is too long, the whole height of my screen, so the OK, Cancel, and Restart Lightroom buttons are inaccessible behind my windows taskbar. I had to turn on taskbar auto hide so I could Ok the changes. I don't like auto hide. I'm not sure if this is a new LR problem or if something in windows got screwed up. I can't remember how it looked before the update, but I never had a problem hitting OK on the preferences screen.
Also the launching of LR when a memory card is inserted is broke again even though the option is turned on. Lots of hours wasted today trying to work through this update. Grrrrr.