The clipping is pretty bad, in my opinion. There should at least be an option for it for players(not a server option). Maybe if it clipped more accurately it would work, but it clips NPC's even when they should be in view.
The draw-it level on Unholy Nation:
And maximized:
The text disappears completely if you're in the lower half of the level. Even if I'm standing right next to canvas 8 I still can't see the text.
While testing this I noticed the Graal canvas stops rendering if you maximize Graal in that level(unevent_drawit.nw). The playerlist still works, but the Graal window stops drawing and just displays a broken view from before you maximized. Didn't seem to have the problem on any other level.