I have the same kind of problems in SMP (14w19):
sometimes player location change when you leave the boat
sometimes, when the new chunk generation is complex and may be late, the boat falls into void while the chunk is not generated.
sometimes, when you quit playing while in the boat, the boat breaks when you load back.
sometimes when you quit the boat, it become solid : it's still visible and immobile, you can stand on it, but you can't get in or move it.
Edgard Neuman
I have the same kind of problems in SMP (14w19):
sometimes player location change when you leave the boat
sometimes, when the new chunk generation is complex and may be late, the boat falls into void while the chunk is not generated.
sometimes, when you quit playing while in the boat, the boat breaks when you load back.
sometimes when you quit the boat, it become solid : it's still visible and immobile, you can stand on it, but you can't get in or move it.