As the title says really. Upgraded to 10.8.3 and everything seemed ok for a couple of days. Then a couple of days ago the internet started going really slow, and today the macbook doesn't seem to be connected to the local network even though the wireless indicator shows it's connected ok. I've tried rebooting our internet connection (router/modem), all other devices in the house are ok (iMac, 2 iPads, 2 iPhones), it's just this Macbook that seems to be having the issue. I've deleted the Airplay stuff from the keychain, but it didn't seem to resolve anything. Does anyone have any ideas on how to resolve this issue?