Version:           4.6 (using KDE 4.6.5) 
OS:                Linux

First of all, in earlier versions of KDE, I had an option to choose my window decoration: there had been Plastik, Keramik and all the stuff—which I can find no longer in the system settings; long ago I decided for an advanced decorator with different look-and-feels (I can't remember how it was called), which seems to be the (only) standard now.

Now when I move my mouse cursor onto the window title, it vanishes behind a black block.  When moving the mouse out of the area, the title (usually, but not always) reappears, sometimes it also changes (typically in konsole, where it had not been up to date anyway, so in this case only the behaviour is actually welcome).  When I move the mouse cursor on the minimize/maximize/close buttons, they flicker madly and sometimes disappear for good.

This behaviour is very annoying and disconcerting, not least because I cannot understand why something should be done actively in the title bar when I move the mouse cursor onto it.  I only expect any action when clicking (the buttons) or double-clicking (the title area).  OK, I admit glowing buttons on mouse-hover is a cool thing to have, but it's really an extra, and I'd rather go for a stable window title.

Reproducible: Always

Steps to Reproduce:
see Details

Actual Results:  
see Details

Expected Results:  
see Details

I would have posted this as being of "Minor" severity, but the dropdown box entry for "Minor: it's a bug a trivial bug to find and fix" does not make sense, and I cannot decide whether the bug is trivial to fix (it was trivial to find for me though, but I'm sure that's not what the text means).

A proposal for a more appealing text for Severity "Minor" would be: "Minor: a bug I can live with or work around for the moment.", or: "Minor: a bug that does not need immediate fixing." --- something in this direction.