Since version 2.0.2 there are subtle changes in how createElement behave.

1. The createElement first argument, if a String, can only by HTML tag. Prior it was accepting globally registered components.
2. The render function must return some value. Before it was not getting rendered without rising errors.

Both examples raise the Cannot set property 'functionalContext' of undefined error.

JSFiddle Link

http://jsfiddle.net/miljan/vqpwdfrf/2/