Have you managed to login again? You need to enter the password before the button gets activated.
I am one of the 2 arbitrators and if the trade period expires without the trade being completed you get displayed a button for opening a dispute. Then the arbitrator checks the case and does the payout to the peer who deserves it.
If there are technical issues you can open a dispute also earlier with cmd+o when the trade is selected. But don’t do that without reason. The arbitrator is not a customer care agent for answering questions. It should be only used if the peers cannot complete the trade.
If you are not sure how to use Bisq please check out the videos and the tutorials like those:
https://forum.bisq.io/t/bitsquare-tutorial-on-steemit/415
https://forum.bisq.io/t/bitsquare-tutorial-by-cryptocompare/1048
EDIT: After reading your other post I understand now what you meant with seed data… See my reply on the other thread