Straight from the Cast Portal:
Segway use temporarily suspended due to recall
Date: 09/14/2006
Segway Inc. issued a voluntary recall of all Segway products on Sept. 14. Therefore for the safety of all Guests and Cast Members, all Segway tours and experiences offered at the Walt Disney World Resort, as well as backstage use of the vehicles, will be suspended until Saturday, Sept. 16.
The Segway organization issued the recall after identifying a problem that could cause the units to unexpectedly trip into reverse, but the company successfully has identified a software upgrade that will prevent this malfunction from happening.
Segway is sending a team of service professionals to the Walt Disney World Resort to complete the required upgrade to all Segway vehicles.