Update 14.4 Lightroom classic

Der Katalog öffnet zwar, aber es beginnt sofort zu kreiseln. 

By @default4ghguvdagsif

sorry, but what you mean with ".. beginnt sofort zu kreiseln"? Please be more specific and describe your issue more detailed.

In a first step you should try to reset the preferences of Lightroom Classic:  How to reset Lightroom Classic preferences (adobe.com)

It's recommended to backup your preferences before you reset the preferences to the default settings: 

https://helpx.adobe.com/lightroom-classic/kb/preference-file-and-other-file-locations.html