Thr $172,000 deduction does not appear in the deduction and credits, it only appears in the final phase of the of the process- checking out of the information.
I don't understand "checking out of the information".
This number either appears on the tax return or it does not.
Did you go into Forms mode? Do you see a large number on your 1040 main form that appears out of place? Go to the line, and RIGHT Click on the field. Click Data Source to determine where information on the line comes from. Go to the other forms until you find this source of the number.
If you don't see a large number, then it could be information from 2011 that is carrying forward in the summary and should be ignored as an error that does not affect 2012. If you see this number and you are on a summary screen, see if it is in the 2011 column. If so, again, this is a known error, and can simply be ignored.
I looked at the form for deductions as you suggested and found that $174,000 was assigned to a loss incurred from an Roth IRA account. I do not know how this was calculated. I tried to delete but could not.
I found that the $174,000 was related to a loss in a Roth IRA account. How that amount came about I do not know. I deleted the amount and now the calculations are much better. Thank you.