Lonnie,
The frost on the tank tells you what the level is in that tank. Frost only shows when you are drawing from the tank. A lot of times when I think it is time for the automatic switchover to "switch over" to the other tank, I check the tank that's being drawn from and see that there is still a frost line on the tank. That tells me there is still some gas in the tank.
I don't know what the answer is to your problem unless it has to do with some kind of "vapor lock" in the lines. Try turning off both tanks, then turn on the one being drawn from (slowly), then try lighting you a burner on your range. If it works, then your propane is working. Then turn on the other tank (slowly). I know you know all this, but just reiterating.
Orv
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