If you happen to end up with chests and presumably tanks/accumulators of greater than normal quality, the GUI doesn't show up, nor does it function.

Edit: May be important to note that I'm using a mod that adds more quality levels, in this case, normal+

Tested on 2.2.21 with quality chests: a rare sell chest sold its plates and an uncommon buy chest bought plates, both without an error.

How to test: get a rare trading chest (quality chest from a quality upgrader mod, or spawn one in the editor), place it, set it to sell, put plates in. The window opens and the sale runs at the quality multiplier.

If the window still does not open, tell me the mod that gives you the extra quality levels and whether the chest is from that mod.