I have looked virtually hours and hours on the supply map during various campagnes, patches and AI/multiplayer games.
And yes, Johan is right - I haven't seen a not explainable issue in 1.3.
BUT the way supply is designed seemes to me not, hmm, the strongest point of the game engine yet.
What
I would call broken, not as true bug, but a really painful feeling in gameplay:
the only way to avoid the big traffic jam in Berlin is to built as much industry as possible in all provinces that transport supply to relieve the capital. Ok, but how to achieve this in a later scenario? Load the Götterdämmerung... Trafficjam in Berlin??? I quit. Immediately . Honest.
This sight made me sick.
And even building IC on airfields etc. since 1936 is NO guarantee that my fighter based airdefense have enough supply/fuel ALL the time. It really makes me feeling insane that the very last and totally unimportant garnision get supply, but my most important units didn't.
The actual design lookes for a demand and that is not the best way of strategic warfare with fast moving units.Since Dschingis Chan we all know the importance of strategically placed stockpiles - we should be able to put supply beforehand a offensive.
Actually, the design is cheating also: When a division is conquering foreign territory, she is suddenly supplied - a German panzer corps could easily move total supplied through the complete SU as long as they didn't stop... WAD?? I would exspect this in a game like Age of Empires, but not from a clever swedish software factory.
To make it short: Johan, play your game. Make first a nice logistically bombing on your opponents capital, e.g. Moskwa.
Infra down to zero, ok?
Now just switch sides...
Of course, the system works absolutly perfect.