registration spammers

I am getting new registrations at a crazy rate. Like one every 4 to 6 minutes. I just installed the SABRE plug in which says it's suppose to stop such a thing and it shows it has in fact stopped some but there are still showing up. If you check my activity stream on my site you will seem what I mean.

I deleted I believe 100 so far as it pushed all the actual real activity to the bottom.

Could this actually be some type of internal server side script running?
It started after I did the 3.2 update and then had to update everything else to work. During that change I went back to the default BP theme. I am currently using the blogs MU theme.
I appreciate anyone's advice and/or help.