802.1X wireless network problems with Intel Mac

To login to the wireless network at my school I have to use an 802.1X connection authenticating with TTLS, TLS, EAP-FAST and PEAP protocols.
This works intermitently. Some days my MacBook logs on quickly with no problems at all but most days it has a self assigned IP address and I can't use the internet. My friend also uses a MacBook, which acts in the same way. Some days she manages to get on, some days I can get on and some days we are both on together. The problem is really irritating!! We get no support from the techs as we are the only Mac people in the school. The rest of the staff have PCs. The techs are just trying to use this issue to justify why letting people lease Macs is a problem and stop other staff from leasing them in the future.
I did find a solution at
http://discussions.apple.com/thread.jspa?threadID=425113&tstart=0
but this was written in 2006 and I wonderered if this was still valid.
Can anyone help? please???

I am a tech at our school and we have the same problems. still trying to find a permanent solution!
If you turn airport off, then turn on again, (from system prefs > network) does it change from "self-assigned IP Address" to "Authenticated via PEAP)?
the macs are more and more popular at our school, so its becoming more and more of an issue.
cheers,
Harry

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