The other problem I had was in adding 'combat supply' to units still in the Reinforcements 'Arrivals' list, which scrambled the overall amount of supply and this maybe a 'Windows 10' issue, as it hasn't happened in 'Windows 7'. However, there is no advantage in using this feature, which was added in v1.03, as the unit arrives with the combat supply applied, but unable to move, so you get no advantage from early supply. You might as well wait until the unit appears on the map and apply the combat supply then.
I have two games running, one which features in the posted AAR and is 'on hold' and another game I started to check out the supply issue, here is a taster of the second game:

Now I have the game back on the desktop I can show larger images covering more of the map, which is necessary as the front has become more extended, from the situation in the West, 5th Army units now 30 miles from ROME, but blocked, and in the East, back at TERMOLI where 8th Army is still holding several German units in a pocket pinned against the coast. More importantly, I am past CASSINO and the biggest mountain mass in Central Italy, the winter is over, if only there was more supply !
The Germans do not seem to be short of new units, which are constantly entering the theatre, so the Axis is no 'push-over'. I have had some successes and terrible disasters to get to this position and always, always, fighting the shortage of supply.
Simultaneously reading 'Circles of Hell -The War in Italy 1943-1945' : Eric Morris, which despite the over-dramatic title is giving good in-depth coverage of the campaign and validating much of what is in the game.
About to lose the British 46th and 56th Infantry Divisions, as is shown by the red text on the unit counter (they are to be withdrawn for 'Overlord'), whilst I have units in MESSINA waiting to be deployed, but not enough combat supply to equip them, nor sea transport to bring them to ports near the front.
There is so much in this game, when you take the time to look below the surface and quick to play, 41 turns in two days, perhaps one of the few games in the Matrix inventory where it is actually possible to finish a campaign.
In short, great game, had some system supply problems, not sure if it's WAD, but there are work-arounds, or else the problems are not critical. [8D]