Red close button not always working in browser
It seems that the Mac OS is losing the focus even though the X does appear when I point to each of the close buttons (before I click them).
I have reinstalled Mac OS X and applied all the updates but the problem still persists.
This behavior happens only with browsers. I have tried Safari, Chrome, and Firefox with the same results. It doesn't happen if I open several different programs like Picasa, iTunes, Finder, etc. It also doesn't happen if I open multiple MS Word or Excel windows, only browser windows.
I have repaired permissions but still no joy.
Does anyone have any advice as to what I might try next? I searched these forums but could find no one with this problem.
Thanks in advance for the help.
Macbook Air 11", Mac OS X (10.6.7)