Tvheadend

I have a problem logging in to the web interface as non-admin user.
See attachment for my user config.
Whenever I try that, it will again ask for the password.
It does seem to load some part of the UI.
I'm using Firefox33.1 on Win7 64Bit.
TVH is 3.9.1743~ga510248 fom git compiled on the machine (cubox-i4Pro)

Regards
Aydan