Eric, at a point in my starting squatting days, I also had some problems with my lower back, mainly because of tight hamstrings and hips.
Make sure you are flexible enough that in the bottom position, your back doesn't round.
Stretch your hams, hips and also follow the vids other members posted here!
Thanks to everyone that gave me advice.
I'm squatting again without pain...
IM ROCKING AND ROLLING AGAIN!!!
This is good news, but make sure that you are still mobilizing before squatting.
I find it interesting that people advocate "mobility" work prior to strength training, but at the same time often believe static stretching is counterproductive when done prior to strength training. A lot of mobility work is a form of static stretching.
The truth about mobility work is that you should only do it if your current level of mobility prevents you from properly performing a given exercise. Mobility beyond that required for the strength training ROM will do nothing for your strength training.
Frankly, I also feel that stretching and mobility work should be reserved for AFTER training.
Yeah, I thought it was a well known fact that static stretching before athletic activity can lead to injury, so dynamic stretching was considered preferable.
In general, stretching and foam rolling has helped me a lot.
I've also changed my squatting technique a lot, not going to parallel anymore and using a more narrow stance with toes pointed a bit more forward.
Let's hope this problem is behind me.
Thanks again for those that gave advice.