Desktop has disappeared - just background shown

When rebooting after the recent kernel update, in my user..

.. the background (cosmos) is there, the files and folders in ~/Desktop are still there..

.. they're just not shown on screen.

In another user's account, their ~/Desktop is shown normally on the same PC.

Ubuntu MATE Eoan.

I'd suggest to verify the following setting:

Menu System > Preferences > Look and feel > Mate Tweak


That was set...

After a reboot last night, they've come back, but them going missing was weird.