Can't select personal wallpapers on MacOS 26

That's not the bit that's missing. I can select different wallpapers for both screens, although I can only add one folder of images – which sort of makes it a moot point (i.e. I need different folders with different pixel ratios) – and when I do, it defaults back to the ugly new Tahoe desktop wallpaper.

I'm not the only one having issues with Tahoe; the speed issue is pertinent to me too. There are similar issues with the iOS version as well. Anyway, it seems to be affecting some users and not others, but smells of a lack of beta testing. Be assured, my system is about 18 months old and hasn't been modified.

I think this OS needs a big rethink and a massive update. This is the sort of thing that Micro$oft did when they introduced Windows ME. I expected better.

UPDATE 13.10.2025: Randomly went into settings this morning to see whether there was an update (which there wasn't) and strayed into Wallpapers, where I discovered that all my previous folders had magically reappeared.

Selected the appropriate folder for the Portrait wallpapers, and applied them to the portrait screen.

The result was both screens reset to the awful Tahoe wallpaper. So I did the OnyX trick and both screens went black but after a few seconds the right wallpapers appeared on the right screens. So "normal" service is resumed but only after another action using a free plugin.

Not sure what changed. There's been no updates that I can see. Did Tahoe need time to "settle"?

I'd still like to be able to change my Desktop Wallpapers without a fiddle using OnyX.

Meanwhile, operation is still slow and various other issues like not being able to automatically sign in.

What was the benefit that OS26 was meant to bring that was worth these issues?