We update our server to Trade Post mod 1.5. Should the clients also update? If so, then this problem might be fixed by itself, of not:
All items with an effect are no longer sellable by players. Although a valid item is in the player's inventory, the 'sell' button next to the item is not enabled. See Blacksmith's Outfit in the attached example. I've tested this with a variant of 'effect' items such as rings and armours.
