Just updated my own forum with this one, that hopefully gets rid of a resolver-problem. Please report bugs, if you find them.
// 2007-08-05
//
// * Fixed reported bug, based on resolved hosts ending with 127
// * Changed database-tables to get rid of (hopefully) duplicate keys
// * Added resolver-function
// * Added two new block-methods available at the efnet-rbl
Administered from admin -> options -> DNSBL/Open Proxy monitoring
If you still have problems with duplicate keys, try reinstall the new version from scratch. I've removed the keying, to see if it works better without it. I think I should take care of some other problems reported here too, like the exclusion-part, so admins also can exclude domains (not just IP's) from the checking.. At least try, since I guess extra resolving takes extra time..