The ~ in "ng-grid": "~2.0.13" (in bower.json) allows the new minor version, 2.0.14, to be installed instead. This causes the related script tag to 404 and the page load to fail. Using the exact version avoids this issue.

15c15
<     "ng-grid": "~2.0.13"

---
>     "ng-grid": "2.0.13"