System Tray Won't Load

[RRyankees08]

I changed my config.ini in the Material theme to tray-position: center. When Launched the Tray does not appear, and I get this error in console, error: tray: Failed to put tray above 0x0c0001 in the stack (XCB_MATCH (8))

[JoverZhang]

I had the same problem.