Hello:
I had the same problem with a scriptaculous install with the send, submit buttons on the newsfeed, wall, and PM. So I Downloaded from the store all the plug-ins, extracted, FTP'd and re-installed. This fixed the button issue.
But now the newsfeed is commentable by anyone even tho I tried to uninstall and re-install again, I've removed the permission from all roles to no avail, I even removed the free role and re inserted this role again with the same results.
I'm thinking I should never have done a scriptaculous install.
Hope this is in the right Forum