Copy with Mates dialog box misplacement

I frequently us the Copy with Mates command. Out of the blue, when I use it, the dialog panel is way at the bottom of the feature manager, and I have to drag it up so I can use it. See the screen shot. It always used to cover the entire feature manager. Anybody know what's going on? Is there a setting that needs to change?

SolidworksAssemblies