After sailing around a bit today and from what just happened moments ago, it appears to be the new movement code is extremely buggy. I am using the Classic Client.
Frequently when cross server lines, the screen will go grey, then everything disappears and it turns black. This appears to fix itself when you turn the boat. If you need to cross a server line many times in rapid succession, it is a big issue.
After we defeated the soulbinder champion we tried a second time with the lobster guy. We spawned and lured him to the coast of the island northwest of Skara Brea. After a bit of hitting him as best we could, I remember it said we could use cannons on him. So I try to move a boat into position.
It was a huge mistake. I had to cross a server line. This caused me to crash. I login and crash. I login again and crash. I login and manage to get the boat moving away. Being an idiot, I try once again to move into position to fire cannons. I crash once again. My minimap doesn't even seem to be showing my correct location anymore. After several more logins I manage to get the boat drifting north.
But no matter how many times I login, I hear the sounds of battle as if I am right next to it, and spells casted by players fill up my system message box. Eventually I hit the coast near Shame, but the battle is taking place at the red dot below.