Related to this question, I am trying to compare a table of settings to identify some configuration issues. I am using the following formula to highlight differences between two known good configs (Columns B and C) and one that isn't working (Column D).
=OR($B2<>$D2,$C2<>$D2)
The problem I'm having is that values of False, 0 and <blank> all "match" according to Excel.
How can I adjust my formula to highlight these rows?

