On an earlier post I had mentioned that our $1700 credit had been rejected. We finally got the letter with the explanation and they indicated that the credit was valid, but not toward the AMT. Since we were subject to the AMT, no credit. Of course this was completely incorrect as the law was changed for the 2009 tax year. We called and explained and they agreed and said they would revise and issue a refund. However, our presumption is that the "error" was picked up by the IRS' computer, which had not been updated to reflect the change in the AMT part of the law as it relates to the advanced lean burn credit. If you are subject to AMT, be aware. You may get a kick back.