For some reason I no longer can see contents of a selected folder... I should be able to select a folder and in the preview pane see what files are in it.
Two ways: Go to the Tools (menu) -> Cache -> Purge cache (for the current folder open in Bridge)
or
Go to the Tools (menu) -> Cache -> Manage cache...
and from there you either select the one folder as above, or just do all of the folders. Personally I like this one becuase if there are issues with one folder, than others might be having issues as well.