I've played a couple of games where the game has been stifled because the supply card is never drawn. (What happens is that the 'winter is coming' card is drawn, and the deck reshuffled, and supply card isn't shuffled to the top).
The last game we played, a supply card was never drawn until round 7, and we had a scenario where mustering cards would come out, and no body was able to increase their armies due to already being at supply limits.
This problem can also apply to other game dynamics, like bidding on the influence tracks, and to a lesser extent, mustering (because people can always use a special consolidate to muster).
Is this a well known issue, and is there a house rule to mitigate it?
I was thinking you could create a house rule that says 'if supply hasn't been adjusted by round 4, and round 8, there will be a bonus supply adjustment then'.
Another suggestion would be that when the 'winter is coming' card is drawn, you only shuffle the already discarded cards and put them at the bottom.