I believe you forgot to remove the effects folder as specified in the optimization guide. i removed effect folder, but the problem remains :(From ALL the opt dirs? Think effects appears in vanilla hrdlc1 and dawn guard. Make sure you removed from all 3. Also... (will add tonight) Quote: When using DDSopt ( pre-release 3-5755-0-8-0-upd3) on the vanilla textures from textures.bsa, ive noticed several corruptions after optimization. effect\cloudtilefrostsmall.dds effect\fxcloudroundtile.dds effect\fxcloudroundtilelite.dds effect\fxcloudroundtilestrip.dds Also every file in the sky\ directory containing the word "cloud". 13 files in total + skyrimcloudsfill.dds which has already been mentioned as turning the horizon purple. OK Thanks,the problem of horizon is OK now the solution is here https://forum.step-project.com/showthread.php?tid=228&pid=15721#pid15721 but some mountain and rocks are purple...the problem is in terrain dir of vanilla texture...