Server today threw out an error of a corrupted region file, I shut the server down and deleted the corrupted file I uploaded a backup region file from the servers back up files and found this after I restarted the server.
They made a new command to reset regions and after doing so, they said that it is not longer a good idea to delete region files. That might be the issue for you. The new command is "rr" and there are some parameters for it. I believe "rr help" will list the parameters.