Suite Applied PL3 for ver. 4.1.12 yesterday; spambot attacks then began.
 

This could be merely a coincidence, but if it is not, then the programmers should know what is going on. I run a small fan site forum using vBulletin 4.1.12 PL3. Installed the latest security patch yesterday to bring us to the PL3 level. Around 6pm EST, last night, the spam bots began to assault the site with registrations for membership. Fortunately, membership approval is a two step process, and only an Admin can approve. So, none of them got in. I spent a good part of last night, and this morning, banning IP and email addresses. Finally, I disabled accepting new registrations for the time being, until this attack stops (it is still going on). In the almost five years that I have worked on this forum, I have never seen an attack like this. It could be a coincidence that it started after I applied the PL3 patch. If not, I need to know what to do to rectify this situation.

Thanks to all in advance for any advice you may have. :)