hio77: This is a cache issue. Clear cache on browser and things will work again.
What's happened is the router is updated. For whatever reason your browser is still using old files.
Causes things to point to the wrong place and not load or update correctly.
Of course, since correct expiration and naming of resources that may be cached is basic web dev stuff, most people will never encounter things like that these days except on things like this, apparantly coded up by muppets.

