Hello
When i started from Lorient. a tug boat exploded and sankt in Lorient harbor _GE Tug Boat#1 First it ran to shore ,then reversed to other shore and exploded.
I adjusted its waypoints in my game and now it works for me.
This smal bug was in "Jap_HarborTraffic.mis" file.Also there was one freighter that made smoke and run to shore. _GE Coastal Merchant#1
I made _GE Coastal Merchant#1 as docked ship and no more problems.
Hope this helps.
