My inventory screen is a combination of an equipment screen, showing only the part boxes, and an inventory box, both with drag/drop enabled. However, only one of these parts is focused at any given time. This had caused an occasional glitch in the past while attempting to move equipment between the two separate menu parts, but as of 2020 I can't get it to work at all. Clicking on a part or dragging it from the inventory will equip it, but I can't unequip it by dragging or clicking, and I have to actually click on the equipment box surrounding my part boxes in my equipment section to be able to interact with those boxes. Both menu parts are on the same layer, using different GUI boxes, obviously. I suspect the fact that my mouse click is set to 'End' under game controls might also be causing complications for the drag and drop feature.