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Dynamic freeze

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  • Subject: [mg101680] Dynamic freeze
  • From: Andrzej Kozlowski <akoz at>
  • Date: Tue, 14 Jul 2009 05:35:33 -0400 (EDT)

 From time to time when opening a notebook containing dynamic content  
(e.g. a Mathematica demonstration) Mathematica appears to freeze, and  
then the following message appears:

One or more dynamic objects are taking excessively long to finish  
evaluating. You may either disable further dynamic evaluations or  
continue waiting. Dynamic updating can be re-enabled using the Dynamic  
Updating Enabled command in the Evaluation menu.

All very well, except that my experience has taught me that this  
situation is (almost?) always equivalent (from the user point of view  
anyway) to a Front End Crash. Clicking the "Continue" button seems to  
guarantee that the same dialog will return after a further period of  
apparent freeze. Clicking on "Disable Dynamic Updating" is usually  
impossible and in fact I am not sure if I have ever succeeded in  
getting out of this sort of situation without having to Force Quit  

What's more worrying is that this sort of thing happens with perfectly  
good notebooks containing no errors of any kind, including  
demonstrations downloaded from the Demonstrations site. It only  
happens from time to time, fortunately not very often,  but I have not  
been able to discover any reproducible way to arrive at this  
situation. It looks like it depends on the internal state of  
Mathematica rather than on the contents of the notebook.

I am experiencing this now with version 7.01 under Mac OS X, 10.5.7,  
but I think the same thing used to happen in every version since  
version 6 and Mac OS X.

Andrzej Kozlowski

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