Suddenly unable to change file/folder names

Hello,
This happened quite suddenly this morning.  I noticed that a file was saved without an extension and I went to type it in.  I clicked on the file name in a finder window and I typed the extension.  Mac came up with the usual "do you really want to add this extension?"  and I had second thoughts.  I clicked "no" and then I was unable to change the name on any file or folder.  

When I click on the file name to change it, the usual blue highlighting appears and my mouse changes to a cursor.  I can put the cursor into the file name, but cannot type anything or move the cursor with my arrow/home/end keys.  

I am also unable to change the file name in the "get info" panel.

Any help would be greatly appreciated.

Thank you!

getticaAsked:
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strungCommented:
Okay. Have you tried running "repair permissions" from Disk Utility?
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strungCommented:
Turn off file sharing.
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getticaAuthor Commented:
File sharing is off and has been off both before and after this problem started.
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strungCommented:
You didn't say if you were running OS 9 or OS X. If you are in OS 9, you might accidentally have turned on Simple Finder. If you turn it off, that should solve your problem.

See: http://docs.info.apple.com/article.html?artnum=25072
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strungCommented:
If you are in OS X, here are the instructions for turning off Simple Finder:  http://kb.iu.edu/data/aeho.html
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getticaAuthor Commented:
I am in OS X 10.4.  I am opperating on an administrator account and thus cannot have any restrictions on my account.
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getticaAuthor Commented:
That worked.  Any idea how/why they got messed up in the first place?  
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strungCommented:
No idea. But the general rule is that you should always run "repair permissions" after installing system updates.
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getticaAuthor Commented:
Great.  Thanks for the tip.
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