https://wccftech.com/windows-10-1903-cumulative-update-kb4524147-breaks-start-menu/

Microsoft released KB4524147 (Build 18362.388) to the latest Windows 10 May 2019 Update last week, aiming to address all the remaining minor bugs before getting ready for the public release of the upcoming version 1909. It now appears that the latest Windows 10 1903 cumulative update has also managed to bring some new bug with it. As a reminder, Microsoft had said that KB4524147 was a “required security update.”

It now appears that the new update that brought the fix for the printing issue, has introduced a new Start menu problem (via TD). Several users on Microsoft Forums and Reddit have reported seeing error message “Your Start menu isn’t working. We’ll try to fix it next time you sign in” with some receiving “critical error” message.