Tvheadend

Hi!
I'm trying to set up a user that has only access to the web interface and not its config.
Therefore I disabled the checkbox "Admin".
Now I'm facing the problem, that the user with the restricted rights is not able to login properly. There is always the User/Pass prompt appearing, whilst Tvheadend nevertheless loads the page with the EPG. The problem is reproduceable by just creating a user that has no Admin rights.
The underpriviliged user was working in previous versions of Tvheadend.

Edit: I'm using version 3.2.18 from the Ubuntu ppa

Best Regards,
newpipe