I had the same thing happen, the sap was cloudy but had no odor so I started boiling it....five minutes later I was at the clam bake. That smell was not the sweet smells of maple and after a little while it was getting a little revolting. I was going to shut it down, throw it all away and call it over for the season but my son said keep boiling it what's the worst that can happen? you throw it away anyway. well to my surprise after a while that smell went from clams to dirty socks, to clean socks, then to maple. It was a really good tasting B grade.....glad I hung in there!
160 taps/ buckets
2x4 evaporator
10' x 14' sugarshack