What Al Said....
Also, when it's humid out, sawdust easily absorbs moisture from the air.
Put some sawdust in a bowl, and microwave for 60 seconds. Take it out and give it a stir to release any moisture.
When I get the sawdust or chips, the moisture content is around 8%-10%.
The MES is starved for air. If you're cold smoking, make sure you remove the chip loader, open the exhaust all the way and pull the chip pan out 1 1/2". This should give you some additional air flow. Also, try placing the AMNS above the chip pan housing.
Even though you had burning issues, you got good color on your cheese!!