Whem left clicked. Item frames don't drop their items. Also, players who aren't added onto the plot can left click the item frame and make the item disappear. Earlier Today, I was building on my plot when a player who wasn't added left clicked an item frame and destroyed the pants I had put on display. I suggest that this should be fixed.

I belive the items not dropping is a PlotMe bug.

Perhaps Pat could fix it or suggest it to the makers of Plotme.

It is indeed a PlotMe bug. It will be fixed by the next server restart in about 12 hours.