Some walls (apparently at random) sometimes display only in wireframe - but the below is a severe example…
When doing well, this project looks like this:
Today for awhile it looked like this:
Should print something like this:
but printed like this:
I’ve uploaded the project to drop box for the dev team after saving it at the time of this behaviour.
Fortunately, opening and saving a slightly earlier version of the project corrected the problem, as it does with lesser versions of the issue.