Please ensure the URL value in config.json matches exactly the URL at which you access your site.
thanks, that solved the issue.
I'm experiencing the same problem, yet I'm not using Apache or any other reverse proxy.
The forum is hosted on a remote VPS, and accessed directly from an IP address as it currently does not have a domain.
It didn't start right away, it worked normally in the beginning. Reloads and restarts don't help.
I have NodeBB 1.0.3 as well
Problem was solved by leaving blank the Cookie Domain field in Admin -> Settings -> Advanced