Open up the master page file once more in Markup View and locate the user control declaration.
Right after the runat="server" attribute, add the following DisplayDirection attribute that
sets the correct image type:
IntelliSense will help you pick the right DisplayDirection from the list. If you don’t get
IntelliSense, wait a few seconds until VS has caught up with all the changes. Alternatively, save
and close all open files (or restart VS), open the master page, and try again.