Steps to repro:

1. Open Unity Launcher Window;
2. Click New button to open new project page;
3. Press Backspace button.

Actual result:
Weird window with choosing project location is displayed (see attached video and actual.png screenshot). Clicking on either "On Disk" or "In the Cloud" does nothing.
Regression introduced 5.4, possibly after integrating CloudBuild functionality to the Launcher.

Expected result:
List of all recently opened projects should be displayed after pressing Backspace button in New Project page (see attached expected.png screenshot).

Workaround is to press Backspace button one more time - after that you'll see a page with recently opened projects.

Notes:
- Reproducible in: 5.4.0b11, 5.4.0b10, 5.4.0b8, 5.4.0b5;
- Not reproducible in 5.3.4f1, 5.3.3f1, 5.3.2f1, 5.2.2p4;
- Reproducible on both OS X 10.11 and Windows 10.