Ok,
the version 3.9 seems to work. When I earlier said I ‘reverted’ to an earlier version, I did not do it thoroughly enough. I could go back to earlier version, only after Uninstall through Windows.
Then I installed RC1, in connection to SR29, and it seems to work as well.
Then testing with RC2, and there it fails.
So, long story short… RC2 breaks the connection of Worksession objects and Gh Transformations..