I think there is a bug in BluePigment. I have installed the spamprotection module and with that theme, there is an error. I have switched to blackcandy as a test, and it operates just fine. Go back to BluePigment, it errors out. I am using the latest SS release. This should be reproducible.
To save people from having to install the theme, it may be faster to just say what the error is.
To duplicate, with forums installed and spamprotection, go to register.
Fatal error: Call to a member function XML_val() on a non-object in /tmp/silverstripe-cache-var-chroot-home-content-j-u-n-junderwood1960-html/.cache.home.content.j.u.n.junderwood1960.html.themes.BluePigment3.BluePigment.templates.Page.ss on line 52
There are no custimzations or modifications to the site.