Hi Kevin,
I haven't always been as lucky as Skye.
Occasionally, even when I "touch" a formula and/or specifically check the recalculate existing data checkbox before saving, it does not do so. In such cases (if yee dare), I've resorted to clearing the formula, saving, holding my breath while counting to 10, confirming the calculated parameter is indeed blank on some real objects that use it, then resetting the formula, saving, crossing my fingers while counting to 10, then confirming that the freshly calculated parameters are indeed in place. That usually does the trick, but be forewarned that doing so on certain formulas that were "grabbing" a value at a particular moment back in time could actually lose that data permanently.
Alternatively, I invite you to consider our Recalc Parameters solution, which can be run on demand and/or scheduled.
Regards,
Doug