Well, it seems that after rebooting using 'chkconfig NetworkManager off', everything is as it should be.
Now when I go in to configure it in system-config-network, everything is set right (except for the disabled radio box for 'automatically assign IP', which I need.
When I go to activate it then, I get this:
Determining IP information for wlan0:1...SIOCSIFFLAGS: Cannot assign requested address
SIOCSIFFLAGS: Cannot assign requested address
I've even tried making a new 'profile' for the wireless card, so that it could automatically assign the IP, but I still get this