I unhid the app/local files and found the naughty opm.db file, which I think I'm encouraged to delete in order to fix the CC Cloud desktop login problem ("you've been signed out.). I am tempted to delete the opm.db file now BUT...my Photography CC program link is still open through the Photography CC application itself and my updates for Photo CC apparently work there (I just updated my RAW plug-in in Photography CC.) Therefore, I am inclined to NOT perform the fix (that is, delete the opm.db file) UNLESS someone with technical knowledge assures me that deleting the file will not cause problems elsewhere. In other words, my connectivity through Photoshop CC remains open so I can use Photo CC, which is the only CC Adobe app that interests me. However, I would like feedback regarding the validity of my concern. Thanks.
I can't help with any potential interference, but you might read at these links
Sign Out When Sign In http://forums.adobe.com/thread/1450581?tstart=0 may help
-and http://helpx.adobe.com/creative-cloud/kb/unable-login-creative-cloud-248.html