I have TMCC & Legacy. I also have 3 remotes:
[1] The original Cab1, with the telescoping antenna
[2] A [blue] Cab1L
[3] A Cab2/Legacy.
And here's my problem: I am only successful in creating a new lash-up if I use the original Cab1......
When I TRY it with the other 2, nothing happens!
However, after creating the lash-up, all 3 are able to operate it.
Is this a known 'problem', or is my case unusual, or even unique?