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PRD data display error?

I'm troubleshooting a problem that has me perplexed. Hoping someone on the forum might have advice...

I'm using PRD 3.9.1 (haven't upgraded to latest version). I'm experiencing an intermittent problem where numerical data are not displayed, even though a value was returned in the query. Most rows will display the correct value, but occasionally a cell will look as if the value is NULL (though I can see the value if I run the query in a preview). There is no conditional logic on the field which would cause the value to be NULL. Additionally, I know the data is there (just not printed to screen), because I have a second column that takes this value as input, and the second column is shows correct data.

Any idea what can cause a field value to be present but not displayed to the screen?

Thx,
RR

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