I found a conflict between GetDKP and an addon named Stat Weight Score. If GetDKP is enabled, Stat Weight Score doesn't show scores in tooltips from chat item links (ItemRefTooltip). I've tried enabling and disabling the various tooltip options in GetDKP but didn't notice a change.
Could you please check what GetDKP does with the tooltip that causes this problem?
Here is the ticket I've created for Stat Weight Score: http://wow.curseforge.com/addo…-item-tooltips-from-chat/