After the "meteor shower" random event, I had my stack-of-doom army attack a lone ignys and used "auto-resolve", since I knew my army massively outmatched a singly ignys.  To my surprise, I found that every unit in the stack-of-doom had taken 20-40 damage (hero only took 11, the other 6 units were all at least level 11, and all having at least 48 defense).  When I reloaded the savegame and fought the same battle by hand, I had a single unit get hit for 3 damage.  I'm not really clear on how the autocombat works, but when I looked at the "details" tab it turned out that the igny had only made a single attack, but somehow managed to hit every unit in the army with a single "Spit Fire".  This seems to be repeatable; I've tried it with several different armies against several different ignys on several different turns with the same results.  

[UPDATE:] This appears to happen with *any* ability that hits more than a single tile; any and all AOE abilities (e.g. Spit Fire, Impale, Cleave, etc.) will hit *every* unit in the opposing army when used during auto-resolved battles.  If the same system is used when AI players fight monsters/each other, this could be a very serious handicap for the AI.

Additionally, as posted below, the Air Elemental's "Gust of Wind" ability does large amounts of damage (to all opposing units) in Auto-Resolve, even though the spell is not supposed to do any damage.

[UPDATE: added second screenshot, debug.err, and savegame]

https://dl.dropboxusercontent.com/u/89188843/LH_1.0-bug-ignys-debug.err

https://dl.dropboxusercontent.com/u/89188843/LH_1.0-bug-ignys.EleSav

Steps to replicate from savegame: move active army one tile to the right to attack Ignys, select auto-resolve.

[UPDATE: changed title to reflect that this bug is still present in v1.1]