The chance of setting someone on fire depends on where the canons hit, for example other canons or the magazine.
I don't know the percentage to set on fire if you hit mag or canon, but if you only hit hull, it's 0%.
Advanced diplomacy is underway, if this may be of help as a response.
http://forum.game-labs.net/index.php?/topic/13596-such-is-a-lord-simple-politics-and-alliances-part-1-heavily-moderated/
I just stared up the game, and left port. I have 0-1 frames, even though I haven't done anything that could cause this. It was just fine yesterday... :/
So.. this is what they call Hell.
Found it, next content patch will be here 10-15th of April. So hold on to your butt!
http://forum.game-labs.net/index.php?/topic/12677-content-patch-will-be-here-10-15th-of-april-now-lets-drink/