the edit buffer is is always restored after a reboot. If the edit buffer was corrupted by an unexpected power down it will fail and display the error message that you saw. Clearing the buffer will fix this.
@hjscheffler, would you advise a re-install of the OS as a safe precaution in this situation?
Obviously not something to do at a gig as it takes several minutes and i imagine a power-loss during OS installation presents greater problems.
Im not sure how the OS memory is allocated or if it is written to during normal operation but guessing there's a separate memory area for edit buffers and user-files and rigs.