Hey there,
I am having some problems getting wifi to work in i3. I tried to add exec--no-startup-id nm-applet to my config and this braught me the icon, but it can not find any wifi networks. It seems that there are some problems with the session or similar. I also tried wicd or gnome-network-manager all without results. I am using Ubuntu 15.04 and i3 4.10.4. Any ideas?