@Ralf_Weisskirchen Several people are seeing issues with Windows, as for the alphabet search try using the ‘filter’ option, just start typing the name you are looking for.
The iPhone crash workaround seems to be to set the iPhone language to English, this will only be a temporary solution I am sure the Roon team are working on a permanent solution.
Yes the search is slow today, I wouldn’t worry, give things a day or so to settle down, did you set the iPad language to English, not in Roon but in the iPad settings?
Glad the filter works for you.