[SOLVED] No more menu bar and a black rectangle

[j2l2]

Hi,
Linux Mint 18 with Cinnamon was working fine last time I opened it (months ago).
But today, it displays a black rectangle and no menu bar.
https://photos.app.goo.gl/ghXq3JsyPXANlzem2


Only the black rectangle is active (right click), the rest is numb.
Using another tty I top to check for zombies or else, I don't see anything, but I might be wrong.
https://photos.app.goo.gl/72ISeShuM6NVHWbr1


Networking is not connected so it's not related.
Any idea?
Thanks

[Pjotr]

What happens when you boot into Recovery mode (it's in the Grub bootloader menu)?

[j2l2]

Thanks.
I tried multiple things. Long story short: Cinnamon reset did it.

[Moem]

That's great. Now that your problem is solved, please mark the thread as SOLVED in the title of the first posting. Thanks!