Airport no longer works after update.

I occasionally use my imac as a base station to connect a laptop to the internet via airport. Since installing the recent security updates my laptop can no longer see a network (I also connect via a pda and this no longer works either).
Airport indicates full signal strength but clearly there is no network.
Tried deleting prefs but still wont work.

Hi there BDAqua...
I used this Pacifist software and followed instructions on this thread, rebooted, nothing seemed to change. Repaired permissions, nothing changed... I thought, oh well! Maybe I'll go to my local (Warsaw Poland) Apple repair centre.
Sadly, I put my computer to sleep, about an hour later, opened it up with ethernet cable attached for internet, and noticed the wireless icon was now dark... lo and behold, clicked on it and my network was checked (this after having had my password "rejected" a million times before) and ... I carefully slipped the ethernet cable out of the socket... and I was still connected.
So my wireless is working again, since doing all that stuff (back to prior firmware version) but for the life of me I don't know why, since it didn't seem to be fixed immediately after all that tinkering and rebooting! Any thoughts?? Did I actually do something that fixed it (must be, since I finally fooled around with it after almost 3 weeks of no wireless) or was this just random??
This is far too un-Apple-ish, by the way! I was used to this with PCs, but first time I've ever had to get so technical with my Mac!

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