Gabe
You are correct, if the user picks a one stack analysis the FWT analysis option should not be available. Also, the options TAB allows the user to set up an adhesive for a bond panel. Again this option should not occur for a one stack concept. I will ask Phil to consider a software modification.
For a solid laminate configuration F33t will only occur at a laminate radius, or at the panel edge. Hypersizer does not calculate either of these failure modes in Revision 5.7.x.