Deductions & credits

DVD Version.  When I enter all my cash contributions I also get the "unacceptable value" warning $300.  I deleted all my cash contributions and was going to file without deducting the $600.  But TurboTax is still entering $300 on line 12b. TurboTax fails to put the sum of lines 12a and 12b on line 12c.  I have tried all of the work arounds that people post without success.   This is a software problem that needs to be addressed.