I buy Maranatha from Cosco all the time. The container I mentioned above that had gone bad was that brand, actually...but it had been open for awhile.

Even though the date was good, I bet it was still spoiled. I'd suggest you try one more time but maybe buy a packet of Justin's from Whole Foods so that you could try it without committing to a whole second jar. Justin's makes little single serve packets in plain and other flavors (like maple almond butter!). They are expensive to buy all the time, but they are a great way to try it without a big jar commitment.