I do know what I'm doing.... at least when upgrading anyways. I just upgraded my shields like 30 min ago with no problem. However I was forced to leave the station in order to do it. I then went back to the station to buy a new reactor and it would not let me upgrade. So I left again and it still won't let me upgrade. I am using the Lattis/NB and am upgrading to the Megatron.