Can you tell me what you did before that happened? Or maybe know a way to reproduce this?

Well, I just walked from the Falador bank to the mining guild just south of it, and all of a sudden I only saw myself and the NPC's. The entire background, floor and everything turned white and I was not able to walk anymore. So i tried to move my screen with the arrow keys and then this happened 

I'm trying to reproduce it, but it never happens for me. Can you restart your client and tell me if the issue still occurs? (I've updated the client a minute ago)

Well, it happened to me yesterday and I immediately restarted the client. It did not happen again yet.

Okay thanks. Let me know if it happens ever again.