So now I am playing on the new .41.2 version, the stare off is happening again. I don't know what the conditions are but, if it triggers, it triggers when your own action bar is filled.
(first time it happened on a lewd adventure on stage 2, first level against a mermaid; after restarting the game and going into the same adventure the first mermaid was defeated just fine but on the second level (another mermaid) it bugged out just when the second kick of the satyr should have triggered - instead both action bars are set to empty permanently and nothing else happens)
Also oddly enough, the potion bug is still there. On my first adventure on the new version, the potion was there and I used it (demon attack event) but the satyr was defeated. Afterwards I bought a new potion (same type, health pot) but that one never appeared on any adventure.
I am trying to list any details that might have something to do with those bugs so I am sorry for the wall of text!
But in good news - the NullReference hasn't popped up anymore so far! Nice work!