I tried it in a sample database with some very basic expressions (e.g., "field1 desc,"), and although the comma stopped the filter from functioning, it did not cause a freeze (let alone a "coma" ).
EDIT: For my tests, I used both 0.9.25G and 0.9.25H (12/3/2010) -- both portable versions -- with similar results. I did not test the installed version.
(I had some problems with my browser -- couldn't post any answer for a while !)
In any case, I can't reproduce the issue anymore. I must confess that I hadn't tried to reproduce it in a sample DB before posting about it -- I usually do but... I guess I was distracted by something else.
I'll try some more tomorrow morning as there was definitely something with my own DB.
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Leaving a trailing coma at the end of a sorting expression (in the sort text box) will freeze IQ[/quote]