Feb 28, 2013 - Autodesk released a Raster Image Hotfix for AutoCAD Map 3D 2013
This AutoCAD Map 3D and Infrastructure Map Server 2013 hotfix addresses an issue whereby large Raster files over 2.1GB were not visible in the selection window of the Raster FDO Provider.
This hotfix does not apply to AutoCAD Civil 3D 2013.
Get the Map 3D Hotfix here