Demo browser crashes if an example crash

[jecisc]

I got an example that crashed in the demo browser (we should probably have smoke tests?) and after that the browser got totally broken and nothing new was showing when I switched of example.

Maybe we could make it more resilient to this kind of crashes?

[tinchodias]

What kinf od crash is it? This may improve iwth #409

[jecisc]

I got a debugger and the space in the demo was white. Then if I switched example the space stayed white all the time