I've noticed a number of small bugs:

1. When hiring pirates from taverns to blockade cities, an icon (a skull) appears, indicating that pirates are blockading this port. Pirates disappear after a while (defeated by convoys, I suppose) - the icon, however, stays forever.

2. When blockading a port with an owned convoy (with a pirate flag raised), after some time a defender convoy appears in some other city nearby that is trying to lift the blockade. This convoy gets Hulks even if they aren't yet researched.

3. When entering a manual battle with aforementioned defender convoy, an enemy has only one ship, although the window before the battle says there are 3 ships.

4. After researching Hulks, pirates (both named ones, like Lafitte, Kornbrock, etc. and generic ones that go as "Unknown pirate") start having Hulks in their convoys - even if there are no Large Shipyards in the world (where are they getting them?!).

5. Cannot add wagons to wagon trains when the trade route is activated (although adding ships to convoys while trade route is activated works just fine).

Probably something else I cannot remember right now.

P.S.: I would very much like to know if any further patches are planned for Patrician 4. If not - then I won't buy Port Royale 3, knowing that bugs in will be half-way fixed.