Save, output_log, DxDiag:
https://www.dropbox.com/s/535dwmlwr30a7a2/marking_coordinated_attacks_bug.zip?dl=0
1. Attack Justicar with paladin,
2. Attack Justicar with other party member except bear ( i used ciper and a priestess ),
3. Check accuracy in combat log - it's not increased by Marking nor by Coordinated Attacks,
4. Attack with a bear - works fine.
Looks like accuracy can only be applied to nearest party member, if he's not attacking same target, bonus is lost.
It's and old bug, dating back to march ( but not White! ).