I've finally got around to updating (now on r505) and can confirm what Dani has found.
After the update the following command no longer works, t seems to be ignored:
// 10.2 Red, 10.3 Green, 10.4 Blue, 10.5 White
Modules.WithName("LED 10.5").Command("Control.Level").Set("30");
Modules.WithName("LED 10.2").Command("Control.Level").Set("10");
Modules.WithName("LED 10.3").Command("Control.Level").Set("20");
Modules.WithName("LED 10.4").Command("Control.Level").Set("30");
Modified to the following based on Danis example, and it works again:
var parentModule = Modules.WithName("LED Strip Main").Get();
parentModule.Command("MultiInstance.Set").Set("Switch.MultiLevel/5/30");
parentModule.Command("MultiInstance.Set").Set("Switch.MultiLevel/2/10");
parentModule.Command("MultiInstance.Set").Set("Switch.MultiLevel/3/20");
parentModule.Command("MultiInstance.Set").Set("Switch.MultiLevel/4/30");