I get the exact same problem and have searched the whole net looking for a
solution. I don't understand how people manage to use this program. In the end
my filters are set do download ALL, but still, I get this mirror empty
problem.
This is my site I am trying to download so I removed robot file, stiil no
dice.
I am now downloading with backstreet browser and it goes like a charm but I am
still wanting to find out what the problem is.