Bad Airport Connection After Upgrade to 10.5.2

After having downloaded and installed the upgrade to 10.5.2, whenever I start up my MacBook Pro the signal on the Airport is only one-half to two-thirds strength. If I use the menu bar area to turn off the airport and then turn it back on again, I get a full strength signal. What's up with that? Anyone have the same problem and a recommended solution?

I have the same problem.  One blog said to right click on iTunes and select Run as Administrator.  That worked, but only on that launch.  When I closed and tried to launch again, it does nothing.

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