i got 1 bug of ROS 5.0 when i connected via winbox, this is the problem.
try to make 1 mangle rule via winbox,
1. click arrow button of protocol and set protocol value = "tcp"
2. set dst-port = "80", last click apply.
then,
1. click up button of dst-port,
2. click up button of protocol.
you will see dst-port will set back to "80" without user do nothing. , is it bug?