Blend4Web tries to look as close to Blender as possible but there is some stuff to do yet. And there are several features that couldn't be implemented in realtime 3D in any case.
Some load and view, others just lock up or look weird (not what I see in Blender).
Such a behavior often tells us that there is something wrong with a scene. Probably unsupported constraints, material nodes or some other stuff. Usually console (press F12 in browser) can tell what is the problem. Also our default camera tries to align its vertical axis with Blenders Z axis which can change a view you have in Blender.
Main thing one need to keep in mind when working with Blend4Web is that it designed to work only with Blender Internal
materials and scene setups. Cycles
is not supported and will not be supported (or it will be absolutely another engine).
Windows Internet Explorer
As we've mentioned in our documentation
IE still has experimental WebGL support and can have many issues.
If you use Blender Internal
and your html seems to crash, probably you've found a bug. Then a sample scene will definitely help.