I also had a similar issue with OOOs BossBuffScripts. I have the game in German and noticed that the scripts were translated in the esp but still appeared in English ingame, so I recompiled the scripts, but after that everything except the onStartCombat block stopped working.
Now I tried deleting all lines with references to other actors from my script and suddenly it worked three times in a row. Is referencing actors bugged?
OOOs boss scripts usually include references too so that would explain why they stopped working. How can I correct that?