Created attachment 48462 [details] Screenshot showing white kwin thumbnails. Version: unspecified (using Devel) OS: Linux Since upgrading to KDE4.5 RC1 window thumbnails (present windows, window switcher) are shown as nearly completely white rectangles (see attached screenshots). This doesn't happen for the Present Desktop Grid effect. I made sure no X11 components where upgraded when doing the KDE upgrade, so it seems to be definitely a KDE problem. Also since the upgrade the whole rendering is sluggish - every 0.5s it seems to stop for a moment when rendering animations (desktop transitions, menu fade-in, highlighting the hovered desktop in present desktop grid, ....). Maybe this is related to the rendering bug. Reproducible: Always
you've an intel chip? *** This bug has been marked as a duplicate of bug 243063 ***