We upgraded from Silverlight 3.1 to 3.3, but when we did so, none of our old sites showed up in the Application Builder when we started it. I looked at the Sites.xml file in the Builder/App_Data folder and there were no sites listed. It is as though during the upgrade, the install program failed to recognize that we had previously existing sites.
The only thing unusual about this installation is that when we had previously installed the 3.1 viewer app, instead of accepting the default folder name for the Deployed Viewer Applications of "App", we changed this value from "App" to "Viewer" (see attachment). So when we did this 3.3 upgrade, we once again changed the Deployed Viewer Applications folder name to "Viewer", assuming that the installation program would know where to find the previously created sites. The old sites still exist (nothing was deleted), but they don't show up when the Builder app is fired up.
One additional note. We did the same upgrade to another machine where we had not changed the default Deployed Viewer Application folder, and we had no problems. The old sites still showed up, which is why we suspect this change.
Any way to recover from this? Thanks.