Yes! In fact, it turns out that the subtle difference between the four different versions of Silverlight 3 have caused me several hours of frustration. To see which version you have, go to C:\Program Files\Microsoft Silverlight.  There have been several: Build 3.0.50106.00 Released January 19, 2010 Build 3.0.40818.0 Released September 1, 2009 Build 3.0.40723.0 Released … Continue reading Different versions of Silverlight 3?