Along the lines of embarked land unit bugs...
In the attached save, there is an Iroquois embarked pikeman which appears to be blockading Ankara! To see this, go into the Ankara city screen, and look at the Citizen Allocation. You will see that the embarked pikeman is in fact providing a blockade. The water tiles are all marked with the red military symbol, showing they can't be worked.
Embarked units only blockade if you are at war with that civ. Still, this doesn't make any sense, the embarked units have no bombard capability and no attack capability, so they should not be able to blockade.
Yet another embarked unit bug...
In the attached save, there is an Iroquois embarked pikeman which appears to be blockading Ankara! To see this, go into the Ankara city screen, and look at the Citizen Allocation. You will see that the embarked pikeman is in fact providing a blockade. The water tiles are all marked with the red military symbol, showing they can't be worked.
Embarked units only blockade if you are at war with that civ. Still, this doesn't make any sense, the embarked units have no bombard capability and no attack capability, so they should not be able to blockade.
Yet another embarked unit bug...