When you can't see the servers, check servers.cfg in your config folder (if you have one, it will be in your home dir/config).
You could also fool around with /maxservpings
/maxservpings 10
/maxservpings 1
/maxservpings 0
see if any of those work better.
You could also fool around with /maxservpings
/maxservpings 10
/maxservpings 1
/maxservpings 0
see if any of those work better.