Getting started with 0.14 and Visual Studio

I have some problems after installing the branch

I've run
./bootstrap-build.bat -DVisualStudio2005
mvn org.apache.maven.dotnet.plugins:maven-vsinstaller-plugin:0.14-incubating-SNAPSHOT:install

The addin is in the Tools menu, but clicking on it the only result is
that the menu entry gets disabled
Started VS with /Log and I see the AddIn loaded entry but no errors

Tried uninstalling (deleted addin from My Documents, delete NMaven*
from the assembly cache, removed .m2/)