Windows 8 Tile does not update - windows-8

Question

The following code worked when I followed the tutorial using a new project:
http://www.amazedsaint.com/2011/09/hellotiles-simple-c-xaml-application.html
However, I am unable to get the application's tile to update when I plug-in the same code to my real project.
I have rebuilt the package.
I have uninstalled and redeployed the app.
I have updated the wide logo image file.
I have verified that the same code works when creating a new project.
I have verified the app manifest as suggested by the linked tutorial.
How does this work fine in one solution but not the other?
public MainPage()
{
this.InitializeComponent();
ClearTileNotification();
SendTileTextNotification("Why isn't this working!");
}
void ClearTileNotification()
{
// the same TileUpdateManager can be used to clear the tile since
// tile notifications are being sent to the application's default tile
TileUpdateManager.CreateTileUpdaterForApplication().Clear();
}
void SendTileTextNotification(string text)
{
// Get a filled in version of the template by using getTemplateContent
var tileXml = TileUpdateManager.GetTemplateContent(TileTemplateType.TileWideText03);
// You will need to look at the template documentation to know how many text fields a particular template has
// get the text attributes for this template and fill them in
var tileAttributes = tileXml.GetElementsByTagName("text");
tileAttributes[0].AppendChild(tileXml.CreateTextNode(text));
// create the notification from the XML
var tileNotification = new TileNotification(tileXml);
// send the notification to the app's default tile
TileUpdateManager.CreateTileUpdaterForApplication().Update(tileNotification);
}