from 23.04.2024 it is possible to login but after login all box webside is white, os x el capitane and Chrome

Hello 

Yesterday was ok, but from 23.04.2024 it is possible to login but after login all box webside is white, os x el capitane and Chrome (Imac 7,1, 2007), last 5 Years everything was greate.

On secend computer Macbookair (sierra 10.12.06 ist ok) ? 

Box change something ? for old systems ?

Best Regard 

BOX customer from 2010 

DS