Be sure you go though the ENTIRE education interview including "Education Information" located at the bottom of the "Here's Your Education Summary" screen
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The Lifetime Learning Credit (LLC) is a non-refundable credit. If your income tax liability (lines 16- 18 of form 1040) is already 0, then the LLC is calculated to be 0.
Also note that the LLC cannot be used to reduce self employment tax (line 23 of form 1040).