Hi Harper,
Yeah it was a combination of things, firstly make sure you can use standard shopping cart. This will highlight any configuration problems (such as total price coming up as zero). That will stop the bug report reported here.
You may wish to take a look over at http://www.zen-cart.com/forum/showthread.php?t=55143 where there are a few other niggles that have popped up, plus a fixed module file. However you will still need to fix the DB bug manually. Applying the fix on that thread will allow you to sit on a level playing field.
Hope that helps
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