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I removed and installed with no change.
Change settings to turn them off and on but experienced the same problem.
Log out and log in to WPMU dash and same problem.
Wouldn't let me get past and I needed the job finished quick so I used your code to clear cache and clear the lock and was able to use it again.
Maybe have an option in the back end to force a stop/clear would ideal to get around this in the future for whatever reason it was caused.
Regards,
Chris