There's a new hotfix available for those looking to migrate settings to Map 3D 2013. Take a look at the download page and grab it if you are going to migrate from a previous version or if you have experienced some unexpected exits after migrating.
Not sure if you need it? Here's more detail from the readme about what is addressed:
Map 3D might exit unexpectedly after doing the following steps:
- Launch AdMigrator.exe (for example from C:\Program Files\Autodesk\AutoCADMap 3D 2013)
- Select Map 3D 2010 or Map 3D 2011 and click OK
- Double click to launch Map 3D 2013