In this post, Tim Heuer is trying to make you understand the situation around the recent
Silverlight releases and the September 2010 2nd service update.
Source: Method ~ of ~ failed
Recently our team released a service release for Silverlight on 1-Sep-2010. We affectionately call these “GDR” releases (general distribution release).
In the GDR1 release (version 4.0.50826.0) we also released an update to the SDK. This is where it can start get confusing…allow me to attempt to explain. GDR1 released: