Heroes 5.5 WarGame Edition - Tactical Edition.

Dark replenishment has been removed (due to a bug that allowed casting spells for free).

Could you provide more details if possible? I haven't encountered this (probably because I rarely upgraded this skill), and is this bug unfixable?
P.S. Regarding bugs and their fixes, you mentioned that one of the reasons for removing the education upgrade for Orcs was a bug with the mentor's cooldown – you reset the education, but the stats from the education remain. This can be fixed (I think I mentioned it somewhere before). The problem isn't with the Orc, but with the Orcish education – the duplicate education needs to be removed, and the Orcs should be given a regular education, and then everything will be fine.

Added 2 minutes later
If you know of any other buggy perks, please let me know – I need to clean them up as well.