Anders Brix

I cleaned up my file: deleted some elements not in use anymore, and the classes that held them, and then the problem disappeared.

I adjusted heights of a few wall components and all of a sudden all my sections show random, skew lines. I tried quitting VW and restart computer, but the problem is still there.

Hello Matt Panzer, Thank you for your answer. This makes sense. I guess my workflow of drawing 2D in design layers is partly a left-over from previous decades, where all I did was 2D. I use the section viewport on design layer merely as a reference for overall placement of main elements, and build the entire section drawing on one or two layers above (two so as to use snap but not modify when stacking geometry). I make a sheet-viewport of those 2D layers and add text, measures etc. there. But I refrain from drawing in annotation space. I think a main reason for my habit is that a detail like, say, the connection between roof and wall is quite complex. Attempts to model the actual connection between the many elements (in Denmark we build with ca. 400mm of insulation and a collection of membranes, air gaps, and more around and between) seems overwhelming. I have tried, but always ended up with the need to make white areas with no perimeter line in order to cover up graphics in annotation space, and add other line-work on top. Since annotation space is all in one layer, this becomes a troublesome way of drawing.

Structural gridlines show in section viewports when these are placed on sheets. But I can't get them to show when placing a section viewport flattened on a design layer (with the intention of adding 2D detail). Is it possible to get them to show?