Cinnamon 3.0.7 here on Arch though, same issue happening. My desktop background is also corrupted but the selected wallpaper do get displayed correctly on the lock screen though.

Same issue here with Cinnamon 3.2.4, 3.4.1 and bleeding-edge git version as well. Currently working with Nemo 3.4.2 on Arch Linux 64 bits.

My fix was to change cs_backgrounds.py line 773 to

if len(staticNode) > 0 and staticNode[-1].tag == "size":

Before the change, there were no Adwaita backgrounds at all within cinnamon-settings/backgrounds. Now the background shows up and works as expected.

@sparkasaurusRex thanks for this fix!

@icarter09, will this fix be implemented in the source code?

@ranolfi thanks for the update because I thought it was already implemented. I take it you are still having this issue?

@sparkasaurusRex did you put up a PR with your fix?

I am indeed, @icarter09. This has not been pulled into the main repo.

@ranolfi feel free to put a PR together containing this fix. If you aren't able to, let me know.

Will do - unless of course @sparkasaurusRex wants to do the honors! :)

No worries. I'm a fan of whatever it takes to make Mint and Cinnamon better. :)

@ranolfi if you do happen to do it, make sure to tag this issue in the PR.

Thanks @ranolfi I can make a PR. Not sure why I didn't do that when I found the fix.

@sparkasaurusRex no worries and thanks for doing that.

Cool, thanks for submitting a PR. ;)

I just uploaded the fixed package to archlinux's community repository, so within the next couple of hours (depending on when your current mirror syncs) you can get the fix by running:

pacman -Syu 'cinnamon>=4.4.3-1'