This is not a bug report or complaint.
I clicked to view the spam log but the page wouldn't load. I looked at the phpBB database using phpmyadmin and found over ten thousand entries in the log. So, I emptied the table, adjusted the number stopped in the config table (why not, eh?) and now the page loads again.
I'm guessing somewhere along the line there were too many entries to display.
For what it's worth the ACP mod has stopped over thirty thousand bogus registrations on my forum(s).