I've had a number of auto resolve battles happen without any screen appearing telling me they're happening.  And i'm not meaning units off screen fighting, i mean i tell my sov who i have selected to go fight a mob, and he just walks over the square and nothing appears to happen.  But if i watch the xp bar it increased when i told him to move.  Also found that if he got hurt during the fight, his health is only updated (whether i deselect him then reselect or not) when he either next moves or on the end turn.  Makes it quiet hard to keep him alive at times:P.

I would provide a save but it's hard to reliably reproduce, even with a save it's a gamble whether it'll did it properly or not.  It doesn't seem to happen at the start of a game but it does once other weird things start happening.