Well, I tried it out, and it's massive for me. The whole city of Leyawiin is in mid air, and there's some hideous land tears. I can't get past without using the 'Free your ship' spell, not just because of the bridge.
ok. please tell me WHAT plugin did you try? i am using the BC version of shipping with DRAWBRIDGES, which might be different from the original. and BC leyawiin of course. (not OC)
if you use this version too, please disable ANY other mod step for step (even the mods that you think don't interfere here, they may be unclean) to narrow this down...