I encountered this same bug and tried to use it anyway to make a form to resolve the issue I had with the DataAssist Pages forms. I set the labels to go on top instead of to the left and tried to adjust a number of margins even though they had no units attached.
The preview looked fine, but the subsequent form that was generated had NO settings applied and looked just like the DA Pages wizard generated. Is this consistent with the bug because it is like it does not work at all.