It looks like the Hub-Accounts.ini file can get damaged when FlexHub isn't closed manually before the computer is restarted. During the saving of the ini file the operating system can kill the process which will result in a damaged file. The next time FlexHub starts it will find an error in the file and reset it completely.
We're working on a solution, for now the best advice is: make backups, and close FlexHub manually before doing a computer restart.