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Odd glitch opening Mathematica notebook on a Mac

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  • Subject: [mg120834] Odd glitch opening Mathematica notebook on a Mac
  • From: AES <siegman at>
  • Date: Fri, 12 Aug 2011 05:05:13 -0400 (EDT)
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I recently dragged some older Mathematica notebooks created maybe 
three years ago out of their folders and onto my desktop to run them 
once again.  

Each time I try to open any of these notebooks on my current model 
MacBook Pro running fully updated Snow Leopard and Mathematica, I get a beep, and a "Why the Beep" window appears containing 
a Mathematica icon and the message:

     The file you tried to open was not found 
      or could not be opened.                  [OK]

. . . but fortunately, as soon as I click the OK button, the notebook 
opens fine, and apparently operates fine.

These notebooks have .nb extensions on their file names and show 
Mathematica as their default app in Get Info.  I encounter the same 
problem if I duplicate any of these notebook files (Cmd-D), or do a 
Save As on them once they're open, and then dbl-click on the resulting 
new file.  Ditto if I shut down and then restart Mathematica and then 
Open the notebook from Mathematica's File menu.

Creating a new notebook in Mathematica, then Copying and Pasting all 
the cells from old notebook into the new one, does seem to solve the 

Any ideas as to why this happens?

[I'd be unhappy to learn that this has something to do with my current 
version of Mathematica 8 having a different activation code than the 
earlier version 6 or 7 that I used to create these notebooks.]

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