Same here. The system works perfect on 10.10. After upgrading to 11.04 the problem appears. I'm using gnome (not unity), and seems to be related to compiz (i guess).
More info: $ lspci | grep VGA 00:12.0 VGA compatible controller: nVidia Corporation C68 [GeForce 7025 / nForce 630a] (rev a2) $ dmesg | grep NVIDIA NVRM: loading NVIDIA UNIX x86 Kernel Module 270.41.06 Mon Apr 18 14:54:25 PDT 2011 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/747717 Title: 11.04 - opening too many windows causes new windows to render blank white To manage notifications about this bug go to: https://bugs.launchpad.net/nvidia-drivers-ubuntu/+bug/747717/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs