When using third-person camera (using F5 keyboard), I saw wrong sitting direction when riding a horse, this is happened while facing to any position direction. Looks weird.
Environment
Microsoft Windows 7 Ultimate x64 Java(TM) SE Runtime Environment (build 1.7.0_21-b11) 64-Bit RAM 8GB
i can confirm this bug, but i don't know if it is a real bug!