https://www.bleepingcomputer.com/news/microsoft/windows-10-kb4524147-cumulative-update-breaks-the-start-menu/

The KB4524147 Cumulative Update for Windows 10, version 1903 is causing the Windows Start menu to crash with a critical error according to numerous user reports.

KB4524147 was released yesterday as an out-of-band security update together with a standalone IE Cumulative Update and some monthly rollup updates, and it is designed to address a printing issue plaguing all supported Windows client and server versions.