Compass 1.14.6 (tested on OSX)
I was trying to open a .js file containing an aggregation in Compass. It seems that this is not currently possible in any button or menu in Compass, I tried to drag and drop the file from a Finder window.
The js file got opened inside the Compass window and I can't get back the Compass UI anymore. The only way to get back the Compass UI is closing the window and opening a new connection.
Please disallow drag and drop of files to the Compass window or handle it properly.