I'm still getting this with Chromium (Version 25.0.1364.160 Ubuntu 12.04 
(25.0.1364.160-0ubuntu0.12.04.1)) running KDE.
This only seems to happen when I have a large number of tabs open (about 150 at 
the moment, but I think I've seen it happen with less), having been running 
Chromium for over a day.

I have put together an ugly fix for the problem of the persistent windows - the 
following is a shell script that uses xdotool to hide any window that is 
clicked. This means that the menu shadow can be hidden without closing Chromium.
---
#!/bin/sh
id=`wmctrl -v -r :SELECT: -e dummy 2>&1 | grep Using.window | grep -o 
0x[0-9a-fA-F]*`
xdotool windowunmap $id
---

This script requires wmctrl and xdotool, which can be installed via apt:
> sudo apt-get install wmctrl xdotool

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https://bugs.launchpad.net/bugs/868841

Title:
  right-click/context menus freeze and won't go away

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