I just had the same problem. I started by clicking on the Windows icon for Safely removing media and selecting the Clip Sport. I waited then unplugged the Clip Sport.
Then a message “FW Updating” appeared in bright white on the Clip Sport itself. Presumably, FW means “firmware”, and it was in a stupid mode where it was transferring one byte at a time to the Clip Sport, with no user support.
I tried fixing the problem, and finally found that holding down the main/power/center button for about 10 or 15 seconds interrupted the mode, and returned the unit to proper operation. This information should be added to the user manual, IMO.
I tested by plugging it back into the computer. The computer reported identifying the Clip Sport device properly.
Windows 8.1
