Does anyone else have issue trying to stat a new save on the newest expedition ?

When I try to do so, the option is greyed out (see attachment)

My game is up to date, via GOG)

No issue. The expedition has yet to start. See the comment on the release log/announcement for version 6.0 - no date listed, just says soon or shortly. Only recently have they finally started delaying the expedition until most of the game-breaking bugs are patched.