Node Webkit might have caused it, actually. They have a nasty habit of blacklisting older hardware for WebGL so they don't have to bother with legacy support. Try making a text object and set it's text to "renderer" every tick. (Without the quotes, it's a system expression.) Or you could run it in debug mode and check the renderer from there, but that won't work if you want to test the exported version too.
If it says Canvas2D instead of WebGL it's probably Node Webkit's blacklist. C2 has a way of ignoring the blacklist that might be broken in the beta so you may need to wait for a full release.