I just installed ArcGIs explorer 2012 Betá on one of my computers, which had an ArcGIS explorer 1750 installation.
We are not using ArcGIS Explorer yet, because of the limitations\configuration of our proxy server (according to the local ESRI branch). ArcGIS explorer crashes when accessing online data.
I was hoping this problem might be solved in the 2012 version, however when initiating the new version after showing the initial screen ArcGIS explorer crashes withou any message.
Cheers,
Bart