Font Color IIF Function

I'm having an issue with the IIF function for my font color. I'm switching over a report to SSRS 08 R2 from Crystal, and the whole thing works fine, except for the font color on one column. Here's the code:

=IIF(Variables!Seth.Value - Variables!Bob.Value > 5, "Red",
	IIF(Variables!Seth.Value - Variables!Bob.Value < 0, "Blue", "Black"))

I checked both the fields and they both pump out the correct data, but the Crystal changes the color of way more fields than the SSRS. Is this an issue with SSRS or could I be missing something?