I'm running Photoshop 2017.1.1, Bridge 18.104.22.168 and Mac OS 10.11.6
When I double-click on an image in Bridge, it opens on top of Bridge without switching to Photoshop. I have to switch over to Photoshop myself, where the image is open. The same thing happens when I right-click and choose "Open," and when I drag the image to the Photoshop icon in my dock.
What's going on? I don't know if this is a problem with Bridge or Photoshop.
Thanks for your help.
Try turning on the Application Frame, near the bottom of the Window menu, and see if that helps.