Binary package hint: compiz
I have discovered a fairly consistent behavior: When multiple aplications are open, the bug can manifest itself as: the active window is blank (white in my case... title bar displays but nothing else.) while windows behind it will display content. If one of the unfocused windows is selected, it gains focus, and goes blank. The previously blank window, no longer focused, regains its content and is no longer blank.
Switching between applications, the ones gaining focus always going blank only to regain content after losing focus is quite infuriating.
To force an application to quit being blank, another application is opened, and applications are switched until the blanking behavior begins for the new application. (I use terminal as my dummy app...) Terminal is given focus, observed to be blank, and closed. The aplication which was behind the dummy application gains focus, and does not go blank. (this has been verified in classic desktop, not yet in unity)
DistroRelease: Ubuntu 11.04
Package: compiz 1:0.9.4git20110322-0ubuntu5
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic i686
NonfreeKernelModules: nvidia wl
Date: Wed Apr 6 21:40:19 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
InstallationMedia_: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcVersionSignature_: Ubuntu 2.6.38-7.39-generic 2.6.38
UpgradeStatus: Upgraded to natty on 2011-04-05 (1 days ago)
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu1