MT-Blacklist v1.61-beta User Guide
mod_perl
Reports say that mod_perl is completely incompatible with MT-Blacklist due to use of CGI.pm methods. If you test it out, please let me know the results as I am not running mod_perl. This is a priority item to research in the future.
Dammit. I wish I was clueful enough to fix it or understand it well enough to suggest a fix.