AutoCAD Civil 3D

[#1]

I am trying to import a LandXML surface into my project.  However, when I click the "LandXML" button in the "Import" tab, absolutely nothing happens.  The command _AeccLandXMLIn appears in the command line, but there is no dialog box and no further action from Civil3D.  Any ideas how I can get this to work? 

I ran into a similar problem with the normal "Open File" dialog box, and had to run a FILEDIA command to turn that dialog box back on.  Is there a command like that to turn on and off the Import LandXML dialog box?

Thanks for any help you can offer.

[#2]

I have the exact same problem but I see this message in the command line after pressing the menu choice on the File/Import/LandXML option

 _AeccLandXMLIn Unknown command "AECCLANDXMLIN".  Press F1 for help.

[#3]

Its opening off the screen. Start command and then press ALT+Space+M and hold your left or right arrow keys down until box appears.