Today I got feedback from IBM that the fix that Microsoft releases does solve the blue screen issue with Notes and the customized home page issue.

Traveler 9.0.1.18 comes with a couple of minor fixes and a big change in the way Traveler Server access mail-databases. In 9.0.1.15 IBM introduced a new check if the Traveler server is listed in Trusted Servers (Server Security Tab) to show a warning if not. Now we know what IBM was preparing for.