Subpixel rendering type of Radiance panel menus is wrong

In Ambience the menu items of the panel are rendered properly both when inactive and when activated.
However when you switch to Radiance the first difference you notice is that the title of the window in bold typeface has extremely jagged edges. The menu entries also look that way until you activate the menu. After menu activation that particular item starts being rendered correctly and the difference between the broken and correct variant becomes clearly seen.

It looks like by default Radiance forces the panel to use a different subpixel rendering type.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: light-themes 0.1.9.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
ApportVersion: 2.0.1-0ubuntu4
Architecture: amd64
Date: Tue Apr 17 15:26:24 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120225)
PackageArchitecture: all
SourcePackage: light-themes
UpgradeStatus: No upgrade log present (probably fresh install)