When enemies Liberating Exhortation is used on an enemy you have effected with Deep Wounds, all enemies (even different groups you attack) from then on are permanently immune to it (it says Deep Wounds is suppressed) until you reload.

 

While the bug isn't so bad as it is fixable with a reload, it does mean Deep Wounds is more or less worthless when fighting any group with a Paladin as you can't fix it mid fight.

Its worse than this.  When deep wounds is suppressed, it actually HEALS the enemies like trolls.  Game breaking for solo rogues against the drake on lvl 5 of Caed Nua and against the Adra Dragon, where I just realized this is what was happening.  Had to reload, luckily wasn't playing ironman. Also, after summoning Concelhaut and him dying, you can't summon other summons.