This is the issue described in the 6th post at ../discussions/254115.html#post613489
Url-generating methods like Html.ActionLink and Html.BeginForm are returning an empty string in some cases. The attached project has two controllers, one of which exhibits the issue, and the other which does not.
Correct behavior: /Admin/Test
Incorrect behavior: /Admin/Players/Create
Start up the sample project and then browse to the two above. Each page should be self-explanatory. View the page source to see the empty action and href attributes on the second url.