Utility can't 'see' any airports

Hello
I am online wirelessly, connected via my Airport Extreme. I also have an Express unit for printing and playing music through.
The problem is that my Powerbook can't print or play music to these units (even though I can connect to the internet). When I use Airport Utility to scan for the units, it can't 'see' them and keeps asking me to re-scan. I have downloaded and reinstalled Airport Utility, but no joy.
The strange thing is that other Mac's in our household can connect without problem, so I assume the issue lies with my Mac.
Does anyone have any ideas as to how I can fix this? Any .plist files I should delete?
Many thanks in advance!

Update - it seems another Mac on my network was experiencing the same issues last night... but it's fine today.
Airport Utility on my Powerbook remains unable to see either the Extreme or Express.

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