Sorry, but I'm unable to find a clear way of describing this...
I noticed on the Equinox map while in a gv that one of the thin, vertical-type tree textures has a transparency bug. The texture is like a vertical sheet of glass with trees 'painted' on it.
While the sky is visible through the area supposed to be transparent, smoke in the background is not visible through it. The entire flat, rectangular texture is outlined by the background smoke.