I've seen isolated reports of the Silverlight plug-in expiring here and there today from a few developers who have the 1.1 alpha installed on their machine. The RTM version of the Silverlight core is 1.0.20926. If you have any other version number on your machine than 1.0.20926 or 1.1.20926 (check by right-clicking on some Silverlight content and choosing "Silverlight Configuration"), you're running a pre-RTM release and you should update. (Since you're running a pre-RTM release, the safest thing to do is to uninstall and reinstall.) For those who are interested in more detail, let's explore the technical differences between the 1.0, 1.1 alpha and the final 1.1 builds. Silverlight 1.0 is at its heart a XAML rendering engine that supports media, 2D graphics and animation, all orchestrated by JavaScript. Earlier this year, we released a 1.0 beta of the rendering engine, along with an alpha release of 1.1 that adds support for the CLR and dynamic languages. Both have exactly the
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