Airport settings lost in osx after using windows 7 in bootcamp??

Hi forum members, I thought I'd ask this question as I have been noticing this in the last few days.
First things first, my kit:
13 inch MBP with 2.3GHz i5 processor. 4GB RAM running OSX 10.7.1
My problem:
I recently set up a bootcamp partition runnning windows 7 upgraded from windows XP sp2. This install went well (considering the number of threads to the contrary!) and I now happily run windows 7 pro in a partition on my mac.
The problem arises when I return to OSX having just been on the windows 7 partition. I can't connect to the internet with airport. I can make a connection to the router but it cannot actually make a connection to the internet itself.
I have found one solution which requires me to repair the permissions in the disk utility after I first log back in to Lion but I'm a bit worried about continually doing this as I don't know what the long term effects will be if done frequently.
Can anyone suggest a) what might be happening, and b) a better solution to the problem than to have to head into disk utility after every windows use?
Thanks in advance and best regards,
Dan Drysdale

An update/follow up for anyone else who had seen this thread:
What appears to have happened is that the DHCP lease has been getting reset so going into
system preference - network - airport - advance - tcp/ip
and renewing dhcp lease seems to bring the internet back.
I dunno, if that's the ultimate solution but it appears to be what is happening at least as far as I can see.
Smarter people may know better.
Cheers,
Dan Drysdale.

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