Well, I updated to 2.4.7 to see if that was it, but it still works for me. Did you restart the server after updating contextFraction.pl?
It still sounds to me like the old version is in place.
If you are sure it's not, then can you send the pg file and the seed that you are using and I'll test with that.
Davide
WeBWorK Problems
nicestring and fractions with contextFraction.pl
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