In this case I have Telegram and Dropbox tray icon, they are auto-start apps. When I login to system, their tray icon might be black-background. https://www.dropbox.com/s/sh2dqfrlo6ywquj/tray-icon-black-background.png?dl=0 However, if I quit Telegram and start it again, there will not be black background anymore. https://www.dropbox.com/s/5syfzlbo08zaqlg/Spectacle.CD4274.png?dl=0 Reproducible: Always
Created attachment 100613 [details] image from dropbox
this is probably from the xembed-to-sni proxy?
*** This bug has been marked as a duplicate of bug 356937 ***