when you say but I cannot gain access if I do the same routine from say a work laptop (which I often bring home with me) - Incidently, all macs were as they should be on all of the computers. I have tried various different wireless chipsets (centrino, atheros, cisco), and nothing works.
Can you post your results here so we can see any errors or any info just incase it's something minor where your going wrong?
Are you saying you cannot connect if you have mac filtering enabled? or.... you can only connect to a system that 'is in your filter list' but when this mac has been faked you can connect??
Again, it's easier for us all to see if you just copy & paste your session here & I'm sure if not me, someone else will be able to assist