Try signing out of the CC desktop app, then sign back in again.
No good. It's installed and all my other adobe applications work.
I'm experiencing the same exact issue
I give up. Going to have to think about this whole adobe CC thing.
Same here. I have tried everything .. log in, log out, restarting MAC, reinstalling LR CC but nothing worked. Maybe because my account is not US but Czech? I tried buy LR6 from Czech Adobe site and it have failed too.
I had the same problem (Lightroom CC doesn't appear to run on Widnows) and your solution worked for me. Note that it isn't enough to just close and restart Creative Cloud. This is what I did:
- Open Creative Cloud
- Open Preferences and hit Sign Out
- Sign back in again...
- Now start Lightroom CC. This brought up a dialog labelled Photoshop CC saying that it needed to be signed in. When I dismissed it Lightroom then started up.
Something else I noticed that may help diagnose this issue is that the file amt.log contained the line:
04/21/15 23:09:07:623 | [INFO] | | | | AMT | | | 8804 | Application licensing status has changed to unlicensed.
See also the article Troubleshoot launch errors using logs | Creative Suite 5, CS5.5