Comment 197 for bug 729979

Ubuntu 13.04 on a different computer; now I'm using noveau (or whatever it's called what comes by default with Ubuntu) instead of proprietary Nvidia drivers.
Problem still there, but windows are now TRANSPARENT instead of black.

It's not just switching windows, it's WHATEVER RANDOM WINDOW that is opened and given focus, including even popups (e.g. confirmation or error popups) and submenus.

Examples:
- in Gedit you hit Ctrl+H, and the Search and Replace window that pops up, at random times is transparent.
- in Google Chrome you click on the menu button on the top-right corner: the submenu at random times is transparent
- in Nautilus, you right-click on the background of a folder; the context menu is fine but when you choose a submenu item, the submenu comes up transparent (but it works if you know where to click blindly)

All of these happen at random times, but when they start happening with a given application, they will usually keep happening systematically untill you close and relaunch that application.

So how do I get the supposed fix that is supposed to have been released?!?!?!?