Hi Crusoe - I'll need to see an example of the problem in order to fix it.

If you don't want to post it here you can send it to me at moi@moi3d.com and I will keep the data private.

Also, make sure that you join any surfaces that were created individually - there is extra work that is done on joined edges to ensure a common edge structure, it is easy to get holes in the result mesh if you have surfaces that are positioned adjacent to one another but not actually joined to share a common edge.

If you send me the model data that you are having a problem with, I can look to see if it is that problem or if it is a bug that you are running into.

- Michael