Recently we got a few reports where exporting or importing Shape files (SHP) or SDF files (MAPEXPORT or MAPIMPORT commands) provided a dialog to name the file but nothing after that. The issue only happens with Civil 3D 2014 and Map 3D 2014. So users were unable to see this dialog.
It took a while to find it but luckily this was already documented and the hotfix was released. It involves replacing an old providers.xml file with the one provided on the link. All you needed to do is to unzip the providers.zip file and replace the old one found in:
Civil 3D 2014: C:\Program Files\Autodesk\Autodesk AutoCAD Civil 3D 2014\bin\FDO
Map 3D 2014: C:\Program Files\Autodesk\Autodesk AutoCAD Map 3D 2014\bin\FDO
Then restart Map 3D. Here is the link to the Technical Solution.