Well that though occurred to me. However, after 5 installations, and the program always indicating it was Sketchup Pro in the license, I just feel that I had the right version. No offense taken, I checked and rechecked after it still appeared after the 2nd installation.
The last time I used 3d export was more than 2 month ago. I do a lot of 2d ACAD export and everything seemed OK. On the weekend before I found the problem I had installed TubroSketch Studio, the rendering program. I don't have time right now to re-install that program to see if TubroSketch's scripts and dll were the problem. I removed TubroSketch and all the scripts and dll before the re-installs.
Thanks for the input, now the dwarfs are singing, “Hi Ho, it’s off to work we go”
Ken