@crazyman It's not real clear by the top of the job but this error relates to SMP Server Multiplayer and LAN Multiplayer based games only, Single Player works fine
@crazyman are you playing single player or multiplayer?
Replicated issue on SSP Open to Lan.
Player 1 (Host) is able to ride horses, however Player 2 (Client) is unable to and is unable to join server until their player datafile is deleted.
Ok guys just confirmed the same error when using:
-Boats
-Minecarts
-Saddle on Pig
-Horses
Anything that you "Ride" will fail