Hello!I thought I would add how I fixed this problem (Black Sky in FSX) on my system. I must have added a "cloud fix" addon or something. I looked in all the folders under /MSFSX/ShadersHLSL/misc... in that folder I found one file that had a much newer date than the others. Luckly, the old file was there as well with "COPY" in it's file name. I deleted the newer file, and renamed the old one. Problem solved!BTW, the file was named "SwarmCloud.fx". Hope this helps!