Per DM Tarokka's request, posting this bug:
In the PaL RVT Store location:
* Had a PC who is not in the faction enter a faction zone, but I had forgotten to mark him as friend with faction tool. Guard attacked PC, PC fled and lost consciousness, I apologized profusely.
* PC was revived, I marked PC as faction friend with faction tool, PC re-enters store, Guards continued to attack PC, regardless of resetting of faction friend settings (including with assistance from DM Tarokka) or area transitions
* PC would be attacked by guards even while not in a faction zone (in foyer) as soon as they came into sight. Faction setting was somehow forced to enemy at least once during these tests
Hope this is enough information, if not let me know and I'll do what I can to give more!