Version: 4.8.0 (using KDE 4.8.0)
Among others I have the Fade effect enabled. When a window hidden behind other windows closes, it shows in the front and then immediately fades out.
Steps to Reproduce:
1. Start some application which opens a window and closes it after a while. Pretty much any application will do - in my case it's a software manager which opens a window showing package database refreshing progress.
2. Switch to another application that covers that window (e.g. a browser).
3. Wait until the covered window closes.
The covered window appears in front of the covering window and fades out.
The window should not be shown at all. It should close in background.
I have a nvidia video card with the latest proprietary drivers. The described behavior has been there for quite a few KDE releases, it's not new to 4.8.
*** This bug has been marked as a duplicate of bug 158262 ***