Are you able to login to Business catalyst Partner account using your adobe ID and password ?
Try to login here : http://businesscatalyst.com/partnerportal .
If yes, possibly DW settings have some issues, please get in touch with DW team for further help on this. You may contact them via : Contact Customer Care link.
Thanks for the reply. I could sign in to the site you suggested, and have now fixed the issue by reinstalling..