If not causeing, it is contributing. How many gallons of makeup water do you add to the tank each week? THat water is just floating around the room, until it leaves the house.
i have two 5 gallon jugs that sit in the laundry room.
I add about 3 gallons every week to the tank.
Over the weekend I started opening all the windows and doors to help aerate the house. I really think the mold problem is in the hvac unit which is in the garage, perhaps in the coils of the unit.
Its strange though because i've had this tank in there for a year with no problems.