Previously I used Debian testing (made it myself from one of the first editions of LMDE). But finally its broke up and I decided to test LMDE...
So there is a fresh-installed LMDE amd64, Cinnamon 1.6.7+lmde
In LibreOffice when I send anything to print, printing dialog don't disappear after job done, it stuck at the centre of the screen. But it's not a window (not clickable or closeable), just a "shadow". This "shadow" stay even after I close LibreOffice window and its above any other window in all workplaces.
Shadow disappear only after cinnamon restart.
In the meantime all fine in Cinnamon 2D.
Never seen anything like that in previous versions of Cinnamon. Will try to downgrade it.
$ inxi -Gx
Graphics: Card Advanced Micro Devices [AMD] nee ATI RS780 [Radeon HD 3200] X.Org 1.12.4 Res: firstname.lastname@example.org
GLX Renderer Gallium 0.4 on AMD RS780 GLX Version 2.1 Mesa 8.0.4 Direct Rendering Yes