The same exact thing used to happen to me on Classic ALL the time in the past several months. If I'd log onto one server and then Classic, the other server's tileset would appear and be blurred just like those screen shots you have taken. I have no clue how the problem was resolved, because I tried everything to fix it. It eventually went back to normal. If Stefan reads this, he already knows what my gfx card is.
Here is a screen shot from Classic when I had just logged off of NP. It isn't blurred, but it would have if I had moved around.
