The title pretty much speaks for itself. In the MV version of the plug-in, Whenever a Battler Counters an opponent during Active battles, it would often times lead to either the game crashing, or it would soft-lock the game (Meaning it doesn't crash, but the game refuses to progress). The battles work fine on the "Turn" setting, but Countering breaks the game when battles are set to "Active".
On a side note, are Battlers supposed to use their Magic when Countering, or are they only supposed to use their regular attack? Because the former sometimes happens when given the opportunity to Counter.