During the quest "http://www.uesp.net/wiki/Morrowind:Remove_Sjoring%27s_Supporters," Percius Mercius orders me to kill Eydid Fire-Eye and Lorbumol gro-Aglakh. During my previous playthroughs of the Fighters Guild, I will enter conversation with them as soon as they see me and then they will immediately attack me. I am usually able to defend myself without consequence; I won't receive a bounty or be expelled from the guild. None of the nearby Fighters Guild members ever react to the battle either. However, during my current playthrough, even though I am attacked first by both of the characters, I will incur a bounty, be expelled from the guild, and have all the other guild members fight against me. This is making the mission exceedingly hard to complete. The only mods I am running are the MPP 1.6.3b and the Morrowind Code Patch, as well as Tribunal, Bloodmoon, and all the official DLCs. Is there a way to circumvent this bug?

I don't have an answer, per se, but I'm wondering if one of the "bug fixes" tweaked those NPCs Alarm values or something...

That said, maybe try circumventing it in the same way: select the NPCs and type "setalarm 0"

Not sure if that'll work...