Great thanks! This worked for me.
Prior to trying this, i could not add any reminders or create a new list. In settings > reminders the default list was just blank.
I had to turn off reminders in settings > icloud as well settings > mail (etc) and inside each of my mail accounts. It asked whether all my reminders could be deleted, which i was not happy about but did it anyway. Low and behold, all my old reminders now show up, nothing was deleted.
Now, in settings > reminders my default list shows "reminders" and i can see my reminders list and edit and add reminders.
I don't know what apple did to screw this up, but i can't use reminders now together with any exchange mail or icloud. The moment any if these are enabled, all my reminders disappear and i can't add any new lists.