I kind of spotted the problem!!
It reeeeally doesn't like it When I use conditionals related to HP.
For example: "IF: bloodied; ATK: 2" (when at 50% or lower HP, attack increases by 2), or "NIF: wounded; HRESIST: all" (as long as you're at full hp, halve whatever damage you incurr" which basically makes you good for tanking a first hit). The FGU paralysis was because a character had a draconic aura on (AURA: 30 friend; IF: bloodied; FHEAL: 2) which was in turn applied to the whole party and it really smashed things up. I'm still testing things out but as I said before I'm kind of busy lately so I can't extensively check as I usually do. I hope I can make some time soon, though, to see if I can find out more
yeah, I guess I really should... it's just I often add up things so I need to remember to update and delete stuff :s (db.xml being 18 mb right now)