Web API, async file uploading works locally, not on server - asp.net-mvc

Question

Using the following tutorial: http://www.asp.net/web-api/overview/working-with-http/sending-html-form-data,-part-2, I used the following controller for the base of a file upload call I implemented:
public Task<HttpResponseMessage> PostFormData()
{
// Check if the request contains multipart/form-data.
if (!Request.Content.IsMimeMultipartContent())
{
throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
}
string root = HttpContext.Current.Server.MapPath("~/App_Data");
var provider = new MultipartFormDataStreamProvider(root);
// Read the form data and return an async task.
var task = Request.Content.ReadAsMultipartAsync(provider).
ContinueWith<HttpResponseMessage>(t =>
{
if (t.IsFaulted || t.IsCanceled)
{
Request.CreateErrorResponse(HttpStatusCode.InternalServerError, t.Exception);
}
// A whole lotta logic to save the file, process it, etc.
});
return task;
}
To save on space I didn't include the majority of the logic I wrote, since the error happens on the first line within of ContinueWith,
if (t.IsFaulted || t.IsCanceled)
If I run this locally from VS2010, both of the above booleans are false, and the code works perfectly - all of it, even extra few dozen lines I commented out. When I deploy it to a server running IIS7, t.IsFaulted is always true. I've never worked with asynchronous calls in C#, and have only done a few simple controllers in Web API...is there something I have to install/configure/etc. on a production server to make it work?
Making it more difficult is the fact that all of the exceptions that are occurring stay in that task (i.e. don't get caught by ELMAH), so I've no idea how to debug what's happening; IIS is also not logging any errors that are occurring in the event viewer...so I'm at a loss to know exactly what's going on. Any tips on how to make this debugging process easier?