Launch Activity Monitor and Force Quit all Adobe related processes like Creative Cloud, CoreSync , AAMUpdater............etc
1) Right click on Finder icon and select "Go-To" Folder option.
2) You will get a text box, type-in below command and then hit 'Return' key.( " Do not miss ~ symbol " )
It will open User Library folder.
3)Then navigate to Application Support>Adobe>OOBE. Open OOBE folder and trash Opm.db file.
Once you had trashed Opm.db file , relaunch Adobe Creative Cloud app and check .
Still same? Let me know .
If possible post a screenshot.
I believe you are referring to the blank white window of CC desktop app.
Please refer to the threads below where this issue has been addressed: