First off, supps won't repair vehicles, only give them ammo, and even then its not all the time. One time it took 2 supply boxes to give me ammo.
Second, sometimes tanks aren't "solid" for a few seconds after upping. Rounds will just pass through them, or have no effect on them. I've seen a 4000lb bomb from a stuka land ON one and have no effect what so ever.
Tanks are taking an unusuall number of rounds to kill, I had to put 7 HVAP (T-34/76) rounds into the top of a panzer to kill it at 1400yds.
Anyone else noticed these problems, and anyone (coughHiTechcough) know whats up?