We use Windows 7 and users (with user rights) with roaming profiles. I've installed Inventor, AutoCAD and 3dsMax with default settings. When a user starts Inventor for the first time, everything works great. When the user logs of from Windows and logs back on into Windows and starts Inventor, Inventor gives an error report and closes.
If I delete the registry hive: HKCU\Software\Autodesk and start Inventor 2014 again, Inventor works like a charm again. Loggin off and logging back on again gives the same problem again.