I see this as well and have confirmed it happens in unity 2d as well. The preview pane stops getting updates, so switching selected mail doesn't update the preview pane. For me it happens even without scrolling, but it seems to be most common on very long mails. I can easily reproduce it with launchpad merge proposal emails, so maybe the contents of a diff being rendered triggers something? Maybe a gtkhtml bug?
** Package changed: compiz (Ubuntu) => evolution (Ubuntu) ** Changed in: evolution (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to evolution in Ubuntu. https://bugs.launchpad.net/bugs/959276 Title: Scrolling message in preview breaks rendering Status in “evolution” package in Ubuntu: Confirmed Bug description: Very often my mail preview pane gets broken, scrolling the message renders it unusable. Only way to fix that is to restart Evolution. Reading messages in separate windows is affected, too. Please see screenshots. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: evolution 3.2.3-0ubuntu3 ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9 Uname: Linux 3.2.0-18-generic x86_64 NonfreeKernelModules: wl ApportVersion: 1.94.1-0ubuntu2 Architecture: amd64 Date: Mon Mar 19 14:04:23 2012 InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120226) SourcePackage: evolution UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/evolution/+bug/959276/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp