My Bridge folder names suddenly have a dark background - how to fix?

All of a sudden, all my folders in Bridge have a dark background around the title names. And the regular names have vanished... what's up with that?

I've been working in CS6 for years and never have seen this before.

I tried clicking on all the preference settings... but can't change the view back to normal - where the type is not surrounded by a black background.

Any ideas how to fix this?

Here's a picture of how it looks.

Thanks so much