I have been using zbrush for a while now and I have posted about this issue about a while ago now but no one knew a satisfactory solution then, just checked and the problem still exists.
Problem:
When I export my model in a low-ish resolution and bring it into 3ds max, then from max export back to zbrush, I get the weirdest problem when I go back up iterations, here are some pics:
Before IMPORT & EXPORT

After IMPORT & EXPORT

Must be something about the way max exports but I tried every setting in 3ds max OBJ exporter and the problem is always the same. Anyway any help whatsoever would be great, thanks