WowAce

Postal instantly taints the community invite button after load so a reload doesn't even fix it. The invite box where you enter a bnet friends name to invite them gets blocked when you click invite.

Yep, had this issue as well. Here is the call stack: 

1x [ADDON_ACTION_FORBIDDEN] AddOn 'Postal' tried to call the protected function 'SendCharacterInvitation()'.
!BugGrabber\BugGrabber.lua:519: in function <!BugGrabber\BugGrabber.lua:519>
[C]: in function `SendCharacterInvitation'
FrameXML\StaticPopup.lua:4108: in function <FrameXML\StaticPopup.lua:4094>
FrameXML\StaticPopup.lua:4118: in function `OnAccept'
FrameXML\StaticPopup.lua:4964: in function `StaticPopup_OnClick'
[string "*:OnClick"]:1: in function <[string "*:OnClick"]:1>
[C]: in function `Click'
FrameXML\StaticPopup.lua:4145: in function `EditBoxOnEnterPressed'
FrameXML\StaticPopup.lua:4831: in function `StaticPopup_EditBoxOnEnterPressed'
[string "*:OnEnterPressed"]:1: in function <[string "*:OnEnterPressed"]:1>

Yes, this happens to me too for some time now. Please. fix when possible!

Thanx.

 Try to turn off in Postal - option BlackBook. And restart interface /rl It's work for me.

Fixed in release v3.6.4.