Hello Dave, I just came across this post. I know it's from a while back but wanted to ask.....
I found one of these new. The MTH number is 20-21215-1. It is the one with 4 smoke stacks unlike the 20-21217-1 mentioned in your post that I believe has 1 stack. Would this one im looking at be effected by this software issue? I guess I could ask the seller at the train store but thought I would ask you while I was here.
Thanks,
Brad