I did an update to KDE 4.5 recently, and afterwards noticed that 3D effects were no longer enabled. When I try to enable them from desktop settings, I get a pop up in the panel that says another application is preventing compositing (or something like that).

I have the nvidia 256.53 drivers installed and 'glxinfo' says direct rendering is on. I'm also using X server 1.9, but compositing was working with the new X server before I did the update to 4.5.

Anyone else getting this or know a fix?