Everytime I join a siege I get into a weird glitch where everyone is spawned untop of each other with one group of enemies in front (stacked together) and the other normally lined up behind. My side is unable to move and kills off the group in front but gets killed by the group behind. If I jump all of a sudden I'm like 50 metres away from the battlefield. Oh I just noticed that I had version 2.0, maybe that is the problem.
Possible fix for the invisible shoes problem with Harper: remove his feet, (yes it makes the game freeze but just ok the pop-up and return to the game, you can continue then (although tediously)) then sell it to a place you _never_ go to, I accidentily placed it in my inventory which made the game freeze everytime I entered my inv or in combination with party equip, shops etc.
If you do that, you can play with Harper just fine ^^