Faustus: Cannot move valid items into Merchant's Shop stash tab

Bug Report ID: #1.405.140.705

Can't say for sure what triggers it. I have seen it 3-4 times before making this report, at those times it went away by restarting the game, this time I've restarted the game 3 times and the bug persists. I can take items out of the stash tab but not move anything in.