I know you are running v7.5.8 but without digging for what did change in the refresh.
There was a refresh update without any notation a couple of weeks after the announcement of 7.5.8(November 29, 2013).
Memory tells me that the stop forum spam routine was one of them.
If you downloaded it as soon as it was available.
I would download it again.
Just follow the upgrade instructions for upload to your site but since it is the same version there would be no need to run the upgrade script again.
Of course I would make a backup before you attempt this.
