Why Lightroom CC won´t start?

Hallo everybody,
i have much troubles with my Lightroom CC.
When i click on the programm app - the Lightroom-start-screen appears for one second - then nothing happens.
My previous trys:
- re-installing lightroom
- deleting the plist´s
- start the app in different user accounts (Admin and other users - no difference)
Every other CC-App starts normally
Whats the problem? Can you help me?
Thanks for your response!

Open your Lightroom sub-folder by default it is located under user(your name)> My Pictures> Lightroom/
Check to see if there is a file with .lock(LOCK) extension? See the screen capture.
If there is a .lock file present delete the file and try opening Lightroom again.

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