Hello. The duel map issue is caused by either not or incorrectly applying the TychoSh3Patch to your sh3.exe. The patch should be located in the ARB main folder.
Check these pages for further instructions which hopefully will help:
https://www.subsim.com/radioroom/sho...232178&page=17
https://www.subsim.com/radioroom/sho...232178&page=11