Recently started using the 102100 esri services and reprojected some of our dynamic maps to 102100 also.
After doing so the new dynamic maps did not show when selecting them using the livemapswidget. After setting the visiblity attribute to true in config.xml, the layers DO show when the map loads initially. However, as soon as you move the map, or toggle one of the features the map disappears completely, only leaving the basemap. Nothing we have tried brings the layers back into view.
Debugging shows nothing abnormal sofar, having a hard time figuring out what is causing this behavior.