As a reply to my own post, I have exported my topography file (no DTM, just the polygons) to 8.52. For some reason, the DTM function worked this time whereas it would not work before. This same file will not work in VWA 9.01.
When I open the VW 8.52 file in VWA 9.0.1, there is an automatic translation process to convert the file to the new version, and it works.
In other words, as many have posted, VWA 9.0.1 has some problems. Personally, I am working in both versions. When something does not work in 9.0.1, I try it in 8.52. This is a pain in the a__, but what ever. Meanwhile I have spent over $500 in (non) billable time to isolate this problem.
[This message has been edited by compusam (edited 09-22-2001).]