50% of the time I shoot a fireball it does no damage or damage to 1-2 mobs even though there are a bunch in radius. I've read that there is an issue if you target a mob and the fireball hits something else (or an ally) that nothing happens.

I've been trying to avoid targeting and shooting the fireball into the area but I think that the new mod9 autotarget is making this moot. Any tips on how I can avoid fail fireballs?