Umberto: First, thanks for all you do. Then, I do understand your logic; However, if this occurrence would take place at other concourses and airports, I would readily concur. Having dabbled in code writing a long time ago, I do understand its intricacies, but also recognize that settings normally effect more than a single occurrence, which is not the instant case, especially as I have made no changes to such settings in existence prior to these current updates, so if it were settings, or interference, it would, necessarily, also occur at Concourses C, D, and E.
It does appear strange that at Concourse B, the carts are spawned from next to a building, and stutter as they do so, while at the other concourses of KCLT, the carts travel a very long distance, for a long period of time, from far away, while they pass Concourse B, as I have been watching them.
You are the programmer and it is your proggy, so I defer to you and consider your assumption that it must be my computer, or settings, and will simply transfer my A319, A320, A330 and CRJ 900 flights to concourses C, D, and E, of American's Hub to the World, where this does not happen. As you can see from my constant trials and photos, I only meant to alert you and not to cause you stress, or demean your excellent work. Again, thanks for all you do and your wonderful programs. John