Have a few boxes in our fellowship. Cleric was max regular xp but not max AA, the SK was roughly a fresh 75 and still working on AA's as well. Fellowship shows that the cleric is "Capped" when trying to share, and the SK is not. Both were set to share and not in the group. SK was getting Vitality, Cleric was not. Was told that it was because the cleric was at max XP, so i killed the cleric, she was now at 95% xp, 0 banked AA's, still shows as capped. Then I was told you have to wait a while. 3 hours later, and it still shows capped, xp is still at 95% vitality is still at 0%. So far it seems the only difference is that the cleric hit max regular xp, and that shut off the ability to gain vitality.