I have Bridge CC latest version as of June 10, 2018 and a MacBook Pro late 2016, with MacOS High Sierra v. 10.13.5 and it works great with the both PS and Bridge. -Except that the filter option for Stars or/and Labels does nothing when selected.
Is it possible that you're looking for files that exist within stacks? Bridge can't see labels or ratings, or virtually anything, inside a stack unless you use the Find dialog. You're filtering from the path bar, or from the Filter panel? Not that it should matter—whatever you do in the path bar under the Star drop down list should be reflected in the Filter panel, but not, for some reason, the other way around. I'm just asking to know if it's something specific to the feature's location that is making it not work.