Version: (using KDE KDE 3.97.0) Installed from: Ubuntu Packages OS: Linux like the title says. just pick kde box background from plasma wallpaper selector and then minimize/maximize windows, move them around, etc. Weird huh? It almost seems as if it may be because it is a transparent png. Also, this happened when I had kwin composite on, I do not know if it happens without kwin composite. If it is important, i could check.
Are you using the binary nvidia drivers?
Using binary nvidia drivers here, but can't reproduce with composite on or off.
yes, I am using binary nvidia drivers version 100.14.19 (ubuntu packages)
works for me here as well with latest drivers.