XF 1.1 Moderators not able to send PM's

Hi there, over the last day or so my moderators have been saying they can no longer send PM's and can not see the link to send a personal conversation in the pop up box when you click a members name.

I have checked all the settings for that usergroup and everything is set to allow.

Could there be something else conflicting with this? All my members and even I as an admin do not have the same problem as the moderators.