Affects Version/s: Minecraft 1.8.2-pre1
Fix Version/s: Minecraft 1.8.2-pre2
ArmorStands move in the north-west direction if you change the Marker tag between true and false.
1.summon an ArmorStand
4. now you should see the ArmorStand moving diagonal in the north-west direction
(5. if you repeat this 3times the ArmorStand will fall through the ground)