Pm from the posts
Have you set PM permissions in Dashboard/Forums/Usergroups/*group/Front - Can write PM ?
And in Dashboard/Forums/Settings/Add ons/Private Messages/Min number of forum posts user must have ?
Yes / zero
Must be a bug,
with limit of posts 0 was not visible
but with limit of posts 2 it is visible.
Please ask all questions related to wpForo addons in gVectors Team support forum. The support teams for the free core plugin and for addons are different. I'm closing this topic here.