Have been having some issues as of late and thought I had them all squared away, then this appeared.Only happens at alt, usualy when the contrails kick in. More pronounced when viewing from the top/bottom aft.Just upgraded my graphic card drivers and have all 3 contrail files in the effects folder. have played with the Mip Mappingseting but no joy.Windows XP, Service pack 3Nvidia GeForce 8600 GTS4 gig of RamAny suggestions would be appreciated.Cheers,irish3

I would start by opening the fx files with notepad. In them you will see references to .bmp files which must be in the effects\texture folder.I suspect they are missing or have been altered by an add-on.

Thanks for the reply. I have two files within the efects/texture folder.Fx_smoke_rFx_smoke_wThey both have a referance to one line of .bmp as noted below:[ParticleAttributes.0]Blend Mode=1Texture=fx_smoke.bmpBounce=0.00Color Start=162, 18, 2, 200Color End=155, 0, 0, 255Jitter Distance=1.00Jitter Time=5.00TempK=107.00TempRate=0.00uv1=0.00, 0.00uv2=1.00, 1.00X Scale Goal=5.00Y Scale Goal=5.00Z Scale Goal=0.00Extrude Length=40.00Extrude Pitch Max=15.00Extrude Heading Max=15.00[ParticleAttributes.1]Blend Mode=1Texture=fx_1.bmpBounce=0.00Color Start=156, 18, 3, 150Color End=148, 21, 3, 0Jitter Distance=0.20Jitter Time=1.00TempK=107.00TempRate=0.00uv1=0.50, 0.75uv2=0.75, 1.00X Scale Goal=2.00Y Scale Goal=2.00Z Scale Goal=0.00Extrude Length=0.00Extrude Pitch Max=0.00Extrude Heading Max=0.00Is this what you mean and if so, how can I tell if they have been changed ? cheers,irish3