I have the latest patch as at Nov 2012. My problems is that the French general leading a small force, who has the 1% population conversion icon, has been in a Spanish region for 4 turns yet has failed to budge the population from 100% Spanish. I have also noticed that north of Barcelona, a corps made up of various nationalities but mainly French has also had no success in converting the population. However, an army and a corps near Madrid, without conversion icons, immediately changed a 100% Spanish region to French! Am I missing something?
Dan9