I think you’re right! It’s not because I upgraded to 2.7 from 2.6, but because I used “Classic League” map instead of WWII Classic. Classic League is an improvement that adds an internal check on max stack limits, although not the way I would want because it waits until the end of the turn if I recall correctly.
I’m guessing you’d really like that feature (as opposed to no computer help on the count at all), but it would require finding the Classic League map and I don’t remember who told me about it, even though it was not too long ago.
Do you want to use this map with the automatic internal check on unit counts and wait a bit until we can locate a url, or do you want me to redo R1 on the WWII Classic map?