...and, sometimes, the issue is an interaction with another, possibly hidden element.
Drag one of the wireframe walls away from the main project (some fixed amount so that you can drag it back later easily). If it displays, then there is an explicit Solid Element Op, or an implicit interaction with another element such as a beam or other wall. If no change, try changing it to the ArchiCAD layer temporarily. If that fixes it, then the issue would be related to the wireframe status of the original layer.
One of the forum moderators
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