>>However, when the fields are not printing (my condition is true, and the line is removed), I still have this 0.01 inch of space that prints on my report. Multiply this by 400, and I've got a big space on my report.
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>How about this: put a vertical line 0.17 inches high (the hole detail band height), set it's "print when" to the same as your fields (including "Remove Line if Blank"), but make the line white (View menu, Color Palette Toolbar).

As I was trying out your change, I discovered that there was another field on my report, covered up by a field, which had not been set to "Remove field if blank". This was causing the band to print. Let that be a lesson to me; never assume that what you see is always what you get.

Bill