Zeldaz wrote:
Get an oven thermometer to see if your oven is out of calibration. They only cost a few bucks and can save a lot of trouble and waste.
Is the lid on your cooking vessel good and tight?
Don't substitute brown rice for white, if that's what you've been trying, as it takes twice as long to cook.
The ideal rice to liquid ratio is actually 1 to 1.75, for most varieties, but I wouldn't recommend changing the ratios in this recipe, as it has been so successful for so many people. As Chicagoland pointed out, the tomato juice is part of he cooking liquid, so you are actually using a 1:2 ratio.
Some say that hard water can slow the softening of foods being cooked in it.
If nothing helps, I'd take Potsie up on his money-back guarantee!

Wow, sorry about all the typos....
I recently had my oven repaired. The repair guy told me it can take up to 30 minuted for those inexpensive thermometers to register the correct temp. So wait at least that long.
And yes, make sure your pan/ Dutch oven has a tight fitting lid. If not, cover the pan with foil, and place the lid snuggly, back on the pot.