Hey there,
So here is what happened.

I teleported to castle wars using the tyras guard in falador.
My friends list had failed to load since log in so I decided to relog.
My screen turned white and it wouldn't generate the map. However the clan chat kept rolling but i could not right click anyting.
I typed ::reloadmap to see if this would fix it.
This is what happened next.

http://imgur.com/RHuILT4

Restarting the client fixed all of the issues.

I havn't tried to reproduce them.

-Big Chris