Mac mini core2 duo 10.7.2 not seeing files on usb external drives - mac formatted - ownership ignored-  until finder refresh - any idea

finder has problems showing folders& files on external drives on mac mini with 10.7.2
this is affecting 2 external usb drives both mac formatted - ownership ignored
i click on the drive and see nothing
a refresh of the finder window will make the files appear
if i click on a disclosure arrow, the arrow turns down but no files are displayed
if i double click on the folder it opens that folder in an empty view - a refresh will bring the files visible
interestingly if i eject the drive and plug back it , it will usually display the contents of folders already visited last time but not folders i hadn't looked at - they require a refresh
programs such as iTunes can link to those files when they are not visible in finder
anyone else run into this - any suggestions
oh and drives seem to be working fine on my macbook pro with 10.7.3
cheers folks
Simon

John -I'm pretty sure it the mac mini thats having the issue
the two drives - each with their own cable - seem to work perfectly with my other mac
the mac mini is having no problem reading the files itunes and other programs access the files on the drives without a problem
its just the finder is not displaying the files without a refresh of the view
but thanks anyway

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