Here's some of the latest bugs I've noticed:
* ProtoMan is immensely weak to Break chips in that he ends up taking x4 damage instead of x2. An AuraHead plus a DrillArm wastes him in one shot.
* If you click the Battle link during a battle, then go back into the battle, you get a new selection of chips as if the battle just started, including any preselected chips. However, any damage inflicted still stays. This lets you whittle any Navi down to nothing and I imagine it'd play havoc with PVP battles.
* DrillArm doesn't cost any CP to use.