I'm using Google Chrome, Version 39 (64-bit), under Kubuntu 14.04.1 LTS (trusty).
Often, the browser's window becomes invisible after returning from standby, or after opening the window after it was minimized (either by clicking on it in the panel or selecting it among open windows with Alt+Tab).
The only thing that helps to make Chrome visible again is to switch to a TTY by Ctrl+Alt+F1-6 and then back to GUI with Ctrl+Alt+F7.
This has been quite annoying. I would greatly appreciate any solutions/workarounds?
UPDATE: I notice that it happens almost every time after standby/lockscreen when Chrome's window has been in the foreground before.