OK, I changed the permissions on /var/spool/MailScanner.
For some reason my User State Directory = (nothing).
My Run As user and group are the same as yours.
Spam Actions I had:
Spam Actions = deliver
High Scoring Spam Actions = delete
Non Spam Actions = deliver header "blah blah..."
My Max Normal Queue Size = 800.
By the way, I initially did have a problem with some directories disappearing and had to do "9.17 Fix for Ubuntu 8.04 (kept removing directories upon reboot)" in your how-to, but only a portion of it:
Added to /etc/rc.local:
chown -R postfix:www-data /var/run/MailScanner
I see you did a strike-through on that section. Is there a work-around to what I did?
I have restarted mailscanner and am now able to feed ham/spam on all messages, thank you!