Both of my toilets starting having the same leak at the same time and I can't figure out where it is coming from or how to fix it. The water is coming out from the tank where it meets the bowl and is slowly dripping out the bolt holes. I replaced the bolts and rubber washers that hold the tank to the bowl but the problem continued.
For what it's worth, my furnace went out this winter and the house was 45 or 50 degrees for a week or so and that is about the time when the leak started.