I had an occurrence where exiting the v3 Octane Server would not deactivate my plugin license on the webpage, as normally happens. I think it was in this state for a few days but I noticed it when I wanted to temporarily use the v2 plugin again.
I also tried clearing my plugin license by clicking on the Activate button with empty credentials from within Blender but that did not work either. Finally, I tried signing out from SA, but the plugin still showed as active on the web site and only prompted me to sign in again when I re-started Octane Server. I did not attempt to activate any v2 apps as I did not want to chance being locked out of either.
The problem appears fixed right now. I believe mojave may have re-set my account as I e-mailed him initially regarding the issue and he suggested I post the problem here.
This occurred on my Mac plugin; I did not try it on Windows.