Chat Now button near the bottom for Activation and Deactivation problems may help
Asked to sign in after paying may help
Unfortunately, none of those help. I launched Photoshop CC and Lightroom and they're both signed in and work fine. The last time this happened, I had to change my password but I'm afraid that this will deactivate my other apps and then those won't work either.
My guess is I need to delete the opm.db file again but that will have to wait until a reboot. I'll bet one of those stuck, unkillable processes is causing the problem.
I did let Muse update itself this morning out of desperation but it won't launch either. So I guess It'll have to wait until I can reboot.
Finally rebooted. Tried deleting this file again:
and it was still locked. Hunted down and killed every process in the system with "Adobe" in the name or path. Then I was able to delete this file, and now, lo and behold, Adobe Muse was able to sign in and now runs again.
So far all the other Adobe apps also seem to be working.
Grrrr... I wish Adobe would stop treating all of its customers as thieves.