I must have been too impatient. I was able to get on this morning. I wanted to update my equipment and match displays and modems correctly. We have 3 tractors and 3 FMX displays that always stay with the tractor. One display is not listed in the dropdown box and when I try to add the SN to the tractor it will not save. That display was used last spring during planting and sent planting jobs to my office computer with no problems so I feel it has been registered. Can you help?