Im running F17 on my Toshiba laptop. The problem that just began about 2 weeks ago is the machine freezes when I try to connect to a wifi network via the built in adapter. I have tested the machine with Winblows 7 and the problem doesn't exist with that OS, so I know it's a Linux issue. I have also tested other OS's to see if it is a Fedora issue, or Linux issue. I've tested Slackware 13, Slax 6, Lupu, Knoppix 6.2, and PC Linux, all of them froze at the exact same place, when I tried to connect to a wireless via the internal adapter. I plugged in a USB to WiFi adapter and the problem does not exist when I connect to a wifi network. Here are the wifi adapters.
Realtek RTL8188CE 802.11b/g/n WiFi Adapter
Realtek RTL8187 WLAN_Adapter