Ubuntu Gnome 14.10
Manaplus 1.5.1.31 Binary Version (and some other clients before this one)
AMD Athlon II X3 (sometimes I unlock the 4th core into Phenom II X4), Nvidia GTX 550Ti GPU, Realtek HD Audio.
I found this artifact once a while, not often--even rare, but always occur at the exact same spot in Swamp and Graveyard area. It's usually disappear after restarting the client. I thought this is just an opengl driver problem (or even hardware defect, although no problems in other 2D/3D games/apps), because I remember never had this artifact in software rendering mode. But, I'm not really sure.
