Hello,
I just bought and installed combu and I'm unable to login as admin.
I enter the admin credentials from the documentation and the admin login page just reloads itself (config seems OK as if I enter another username or password I get the "Username and/or Password invalid" message).
I get no php error...
There isn't enough informations to understand what's happening, I will contact you by email and check it together possibly through Skype.
FRANCESCO CROCETTI @ SKARED CREATIONS
In case someone else need this:
The admin page should always be accessed on https.
If you are accessing it on http, the SESSION remains empty, as the cookie received from the server is marked to be sent only on secure connections.
Everything is working now, thank you Francesco ! 
Heqtix said
The admin page should always be accessed on https.If you are accessing it on http, the SESSION remains empty, as the cookie received from the server is marked to be sent only on secure connections.
Not exactly correct, it depends on the web server settings (NB: not Combu settings), your web server was setup with this particular setting but I never had this issue and 99% of our users haven't SSL certificates so they usually don't use HTTPS.
Maybe that this setting is the flag session.cookie_secure set to "On" in your php.ini or other similar settings in your NGINX server.
Anyway, if you own a valid SSL certificate it's usually good to use HTTPS instead of HTTP since it encrypts the data too, even if it can have a bit lesser performance (but increased security).
FRANCESCO CROCETTI @ SKARED CREATIONS
