This is the kind of problem people are bound to run into on Starting Strength. It is meant as an introduction to barbell training. When you have developed a bunch of leg strength without the accompanying core strength you run into this type of thing. This is exactly why I (and others like 0311) tell people to stay away from machines and go with the free weights when starting out.

You have a couple of options depending on how your back feels. The first thing is to go A2G. All the way down as low as you can go. This is going to reduce the weight and thus the load on your back hopefully allowing you back to strengthen. If going lower aggravates you back then that points to flexibility problems which you can easily overcome. If you do go A2G, and I advise that you do, you should reduce the weight lower than you think is needed and build back up. You may want to throw in some direct lower back work (I would just do simple extensions) and see if it helps or makes things worse.

Make sure you stretch after every workout.

Check out Phil's journal. He had similar problems. His was an injury but some of the same things apply.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.