This is strangest bug I met so far.

Being tired of making aggies genocide I visited PP1 sewers to kill some poison spiders. Strangely, all my barrel spells fail to cast, multibolt works fine. I can cast all spells in city or in other areas of game no problems, but not in here. Here is video:


Sorry for cropped image but I was lazy to tinker with Open Broadcast Software settings to correct that, hovewer you can see clearly my stats. Poison Lance works fine, only barrels dont. Sometimes spells appear to fail but it cast anyway.