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Can anyone please help? I am trying to connect a ship to a separate module in orbit. I grab the connector with my kerbal, fly over to the connector port and right click it. When i right click, it does not give me the option to "plug", but rather to "unplug"(?) and clicking that option has no effect. However, when i right click another connector port (on the ship containing the winch) the "plug" option is there. Tried searching the forums, to no avail. Any help would be greatly appreciated. This is my favorite mod.

My launch vehicle at the moment of launch. Just before impact. After Impact. Distance of 692.5 meters.