it isn't always green, just when you're leaveing, this is determined in shipFX(I think) in the ship_warp_out (as opposed to warp in) function, you'll see two lines of code near each other for one has warp_effect_knossos or something like this,
I'll change it back if it is truely annoying people (I did this for TBP people)
as for the other bug, I have never been able to see this bug, and I have been playing with the warp effect very closely for the last few days (trying to get that one effect I was once working on done)
I'm tired, I'll deal with it when I'm not half asleep
the "warp pof not found" bug is totaly killed though, right?