From: Gavin Sinclair on
>> I am getting a message:
>>   Server error.
>>   No Stairway, denied!
>>   Looks like something blew up on our end. We've been alerted of the
>> problem, but feel free to open up an issue if you want it fixed
>> faster.
> I had to remove a _test_token cookie (or some name like that) to get
> it working again.

Thanks Trans. I was experiencing the same problem; that fixed it.