Tried your config, just changed to use:
- Kickstart v3.1 rev 40.68 (1993)(Commodore)(A1200).rom
- boot from my fresh/clean wb3.1 installation without any additional data
- add one of my hdds where dopus5 os3 version unpacked to be mouned on boot.
- cd windh_d:amiga/dopus5/
and it runs/works.
If you can do more testing, plz do. I only have "fresh" winaue install with pure wb3.1 for tests.
Probably bug is the same and for daxb, will be good to nail this down and fix.