Widgets are grey on Sonoma

When You upgrade to Sonoma try to get to settings in Desktops and Docks. Scroll down to Desktop settings and you will see widget settings set it to Monochrome to Full Colour.

If you haven't already done so, try booting into safemode. Then after that boot back to normal again and test it out.

Start up your Mac in safe mode - Apple Support (English)

Peter da Silva wrote:

Yes, all widgets are just blank grey rounded boxes.

Try booting into Safe Mode to see if something is blocking them from loading.

Use safe mode on your Mac - Apple Support

In the Desktop & Dock System Settings, there is a "Widget style" setting. It should only affect the Desktop, though.

Not certain but I believe the OP means they are blank.

Not certain but I believe the OP means they are blank.

Well, that would certainly be a different problem.

This worked for me, thank you.

This was supposed to go under Biswareet's reply, but it seems I can't change it.