Just found a very odd bug with 1.08. I'm playing an improved Grand Campaign (version 1.07) as Russia. One of my allies, Hungary, was suddenly annexed by Poland in 1562. However, Hungary was not a vassal of Poland, was not in a military alliance with Poland (they were allied to me), and did not lose a war to Poland--Poland never dared to attack the Russia/Denmark/Hungary/Bohemia colossus that dominated eastern Europe.
Bizarre bug.
Bizarre bug.