Characters change when highlighting in brackets bold text

When the user selects a bold text in brackets, the highlighted text is displayed with random characters.

$ lsb_release -rd
Description: Ubuntu 11.04

$ apt-cache policy evince
evince:
  Installed: 2.32.0-0ubuntu12.2
  Candidate: 2.32.0-0ubuntu12.2

Release: 11.04

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: evince 2.32.0-0ubuntu12.2
ProcVersionSignature: Ubuntu 2.6.38-10.46-generic-pae 2.6.38.7
Uname: Linux 2.6.38-10-generic-pae i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Tue Aug 23 15:42:08 2011
ExecutablePath: /usr/bin/evince
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
ProcCmdline_: BOOT_IMAGE=/boot/vmlinuz-2.6.38-10-generic-pae root=UUID=925073a2-94f4-41d0-b2f2-e938e2813e45 ro quiet splash vt.handoff=7
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature_: Ubuntu 2.6.38-10.46-generic-pae 2.6.38.7
SourcePackage: evince
UpgradeStatus: No upgrade log present (probably fresh install)