Web interface isn't working anymore (Sabnzbd 0.7.11)

[lief]

I am experience a weird and frustrating problem, sabnzbd 0.7.11 launches at startup (with -b0 parameter) but web interface doesn't respond at all. If I remove the running process and relaunch it, problem disappears. Moreover, when sabnzbd starts at login(cold boot/restart) there is curl.exe process under(sub process??) the main sabnzbd.exe process; looked up using Process Hacker. If I end curl.exe process even then the problem disappears.

I have looked at sabnzbd logs but nothing suspicious shows up. The only thing, I can think of, which I have changed recently is the antivirus from bitdefender trial 2013 to avast antivirus. They are purely antivirus packages and not complete internet suite stuff. As for firewall I am using comodo. The fact that problem disappears when I restart the sabnzbd process or terminate curl.exe process, I doubt antivirus or comdo firewall could be a problem. BTW I have been running sabnzbd on the same system for over 2 years with comodo firewall with no issues. Currently, I am also using sickbeard and couchpotato without any problem on the same system.

Edit: Is there any chance that sabnzb is unable to read sabnzbd.ini while it starts at login but somehow is able to read after I launch it again. I am an administrator user.

Please help me fix this problem.

Thanks for your time.

[shypike]

Comodo can certainly be a problem.
It's likely that you have to tell it to allow the curl.exe program too.
curl.exe is used to detect whether an instance of SABnzbd is already running,
but only when you have enabled HTTPS for SABnzbd's web server.
Try it with HTTPS disabled.