Sorry for this but maybe good to be known:
After I did the update via the Web Panel after reboot it kept white. Looking into the html source did not shown any problem.
So I downloaded the actual Iso and did a fresh install (luckily I saved the queue file before).
And what do we see:
The source code changed a little bit in the links to the style sheet, so the page kept white:
From version 2.389:
From version 2.452:
Well, it took around 2h to recreate my Kitchen Radio but the update seems great.
But also sometimes I am coming to a point were I still remember why I don’t want to change a running system.
Best greetings, Gregoa