Framework components not rendered correctly after updating to 3.1

[valdezv]

Hello! I am seeing this symptom after updating Ext .NET framework to 3.1.
Looks like every component coming from Ext .NET is not rendered correctly.

The conditions are as follows:

1. Visual Studio 2012 fully updated and licensed running on Windows 8.1.
2. Running my web application through the RUN button, that launches the "on the fly" web server.
As you can see, I am unable to debug the app.

However, if I publish my web application to my local IIS, everything works fine.

Any hints / clues?

Thank you.