Which version of The Arena is on the server?
 

Since this is classic trilogy, I would assume that you are using the original zone graphics for The Arena. However, I don't believe Titanium has the original graphics for it anymore.

I'd go to Arena and look, but my toon isn't high enough to safely get there. :D

You mean like the arena's in qeynos or freeport? or is that actually a zone?

It's a zone located off Lake Rathear... I haven't been there on this server so I cant say myself

The new arena came out with the PoR expansion so we should be OK.

It's the classic arena. I never did get the door working quite right, but at least it has a door.