For me, I trust session results as a reflection of changes to my inventory in this session. I (usually, with the exceptions I listed) trust the session results as the honest truth, as that's what's should have happened in this session... When I'm not using scripts to use items for me, I usually use items by right-clicking them there. Mainly because if it says that my item count went up by 1, there shouldn't be any way for the count to be wrong, since I have negative results allowed... Anyways, I was just listing it as another fairly trivial inventory bug.