Cliff Southampton

Hi, I am having the same issue with VW 21. I have checked and there are no gaps or intersecting vertices. I try to convert Extrude to Generic Solid, because it tells me that it cannot find volumetric properties for the extrude and will not allow me to combine with other extrudes to form one surface, and it just disappears/self-deletes/gone. Any solutions welcomed.

Thanks. Seems to have sorted this particular issue.

Using VW 17 SP4 and it crashes when using "Select similar" tool (windows 10) when selecting height measurements on topo. Just shuts down instantly. This happens even when starting in new file. Has anyone found this issue and a work round?