Unfortunately I haven't gotten around to playing with the export/import. I'm seeing more threads pop up on Daz forums (latest one about GOZ Zbrush bridge) so I have medium hopes Daz will fix it. Then again, ya never know. Here is what we do know from what phil has posted:

Export to weld seams (works fine) Import (works fine) Export (broken - material zones and facets referencing vertices not exported)

So, the second export has been identified as the point of failure. The question is, how does Daz know to fail? I.e., if we have the script just do export/import once (which works fine), close Daz Studio manually, and then re-open and export that mesh...will the 'second' export work fine? If not, then there MUST be something about the post-import mesh which distinguishes it from the other meshes so as to cause the export to fail. IF it works fine, then can close/re-open of Daz Studio be 'simulated' in the script so as to work around the issue.

These are just some random thoughts I had. :)