Looks like Evan found and squashed the bug
https://github.com/dashpay/dash/commit/a89b0e705fa8fac24c7cfcde52e517ca15246905
For those who can compile: remove peers.dat (to let banned clients connect) and -reindex
https://github.com/dashpay/dash/commit/a89b0e705fa8fac24c7cfcde52e517ca15246905
For those who can compile: remove peers.dat (to let banned clients connect) and -reindex