RT 4.0.3 contained a serious bug wherein upgrades from any version ofRT 3 to RT 4.0.3 broke template interpolation; please do not use it. If you had previously upgraded from RT 3 to RT 4.0.0, 4.0.1, or 4.0.2, before upgrading to RT 4.0.3, you are not affected by this bug.
If you are currently running RT 4.0.3 and are affected by this issue, upgrading to RT 4.0.4 will resolve it.