Since ensuring full supply as much as possible is a key logistic point to the game, it's consequently important to figure out during setup if units are starting in low/no supply, or whether they're being moved out of supply when shifted around. Similarly, it's important to know whether moving a headquarters is improving or degrading supply for units under its command.
The L key which limns a unit in supply color, shows green for all units during setup. The H key which shows the direct LoC trace (from a unit to its HQ and vice versa), also always shows green during setup. Doesn't matter how ludicrously far away the unit and its HQ is, both are always green.
The R(ange) key, however, which manually (not automatically) plots supply ranging from HQs through all hexes, correctly (as far as I can tell) colors hexes green, yellow, and nothing, when used on a headquarter unit.
I can still figure out proper initial supply, or risks I'm willing to take, this way, but if players don't know about the coding problem (it may not be a 'bug' exactly but a limitation in the engine), then they might make poor planning decisions.
In case this is only happening in certain situations, I'm setting up as the allies vs the computer axis, on Operation E.
"Pratt creates a real, hard, dirty world that is somehow still fantastical and full of magic and mystery. Daunting, but worthwhile."
-- Vanessa Lee for Front Street