It's an issue with the map file -- I use updated map files I edited that fix that along with other areas of the map that are "glitchy" such as the black tiles along the coast, or that brown line out in the middle of the ocean. What's the X/Y of that spot again?
I have been helping Telamon compile a list of these types of tiles. Whats the location on that one in that image?
Sorry guys, can't use the UOAM. I'm on Quick's client, and I haven't downloaded the latest UOMapper yet. The tree is at Ralph Lauren's Inc Factory (Yew).