This was happening to my installations of b1500 and b1700 on a new Dell Latitude E6420.
This system was ordered with the nVidia NVS4200M graphics card installed. Apparently the discrete graphics card no longer replaces or disables the integrated Intel HD Graphics 3000 chip.
Prompted by the previous post I started to look for the graphics settings that are vaguely referenced.
What seems to have worked in my case is:
Open the nVidia Control Panel in advanced mode.
In right pane, select "Manage 3D settings"
In left pane on the Global Settings tab, change the change the preferred graphics processor to "integrated"
OR
Move to the Program Settings tab
Add the ArcGIS Explorer Program (E3.exe)
NOTE: Once you add the program, there doesn't seem to be a way to remove it. The "Remove" button remains grayed-out.
And set the preferred processor to integrated.
Apply the settings
And relaunch ArcGIS Explorer.
I prefer the second option, to assign the processor specifically for the program, more as an exception. We'll see how it goes... but it so far works.