Interesting. I still have, and use, my crockpot I bought in the late '60s or so and have never detected any sort of off taste. It's one of the original earthenware-type Rival models. In fact, I have several crockpots in various sizes that I use regularly. I like to make applesauce in the crockpot. It's easy, delicious and makes the house smell yummy.
Meat loaf is good in the crockpot, too.
"As a girl I had zero interest in the stove." - Julia Child
This is real inspiration. Look what Julia became!