Fonts all invisible

After launching, pidgin's main window becomes all blank (save title bar). Buddy names are selectable, but also blank, as are right-click lists. Popup windows are blank as well.

Screenshot attached.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: pidgin 1:2.7.11-1ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-11.50-generic-pae 2.6.38.8
Uname: Linux 2.6.38-11-generic-pae i686
Architecture: i386
Date: Wed Oct 12 10:35:48 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/pidgin
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release i386 (20100816.1)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: pidgin
UpgradeStatus: Upgraded to natty on 2011-05-07 (158 days ago)