Do you see anything in the server access or error log? One thing noticed was that domain.com gets redirected to 123.123.123.123 and this might be an issue, as PhpDig is coded to stay in the domain given for index. You can try changing this by editing the phpdigCompareDomains function in the robot_functions.php file. Also, PhpDig doesn't follow links in 'heavy' JavaScript, but
this thread might be useful. Check out
this thread too.