Attic Walls above open areas won't appear in 3D view. in Q&A Posted March 24 Hello ConleeH I opened your plan in HDPro 2021 Trial and get the same results as you -- missing wall segments as shown in the pic below. I'm surprised that it does not occur with Solver's install of the software. I have experienced this same issue in the past while working on plans. Lately, I have seen posts/plans from others that are experiencing similar issues with missing wall segments over roof planes. Maybe there is a basic setting that is unchecked, or a default setting that isn't correct. I ran a plan check on your plan and there are some walls that are mis-aligned with those above or below, but I don't think it is the reason why the wall segments are missing. Sure there are work-arounds for this issue, but I'm wondering why the model doesn't build correctly, at least not with the most current product release. If you send this into support, please share their response -- it will be interesting to hear their opinion.