Missing class after importing .NET solution

[mlorenz]

I am just trying out the Enterprise Architect Corporate edition using the 30 days trial license.
As a start I tried to import some of our .NET projects.
For hat purpose I created a Visual Studio solution containing all the projects of interest.
The resulting solution is a mix of C# and VB.NET projects.
I imported the solution using the Code->Project->Import a Visual Studio Solution
option from the ribbon.
After the import I am missing at least one important class from a VB project, although
the base class of this class which is defined in the same project has been imported.
Has anyone an idea what could be the reason or is there some kind of import log file
that could contain any information ?