I was trying to build a layout in which fields that required data would be highlighted. I used conditional formatting "IsEmpty ( Self )" to apply a fill color. Fields would not highlight. I realized that two fields did highlight, and I had missed those two fields when setting up Placeholder Text.
I removed the Placeholder Text from one of the other fields, and the highlighting appeared, as expected. As soon as I added the placeholder text back in, the highlighting disappeared.
I'm not sure if this will be determined to be a bug or a "feature," but for now, I'll have to find another way around the problem. (I could try highlighting the field label or placing a colored rectangle behind the field area that hides when the field is not empty, but in both of these cases, the conditions would have to be set separately for each field; the generic "Self" would not work.)
I'm assuming that someone else will be able to confirm this, but I'd appreciate knowing if anyone finds a work-around.