I'm going to guess that the warm weather is partially to blame. It looks like Stowe is not blowing any snow until later today.
I agree it could explain the past day or two and we'll have to see what happens when it gets cold again. Something was definitely wrong when it was cold and they weren't blowing (and for all we know something is still wrong). Was/is it a mechanical issue or did they really run out of water? One scenario can be fixed...the other means Sugarbush is in for a tough season without a ton of natural snow.