This bug also appeared to me after upgrading to 14.10. Network Manager doesn't connect automatically after boot or after resume from suspend.
I followed the previous suggestion (enable "All users may connect to this network" in the wifi connection setting) and it worked for me.
Curiously, I made a few tests and if after enable that option I disable it again Network Manager still reconnects after resume from suspend (but not after reboot).
This bug also appeared to me after upgrading to 14.10. Network Manager doesn't connect automatically after boot or after resume from suspend.
I followed the previous suggestion (enable "All users may connect to this network" in the wifi connection setting) and it worked for me.
Curiously, I made a few tests and if after enable that option I disable it again Network Manager still reconnects after resume from suspend (but not after reboot).