I noticed since the last 2 weeks or so that my thumbnails are not showing up in Youtube when i am uploading my videos. That is so even though i optimize them so that Youtube select it as one of the 3 thumbnails they usual show when you upload your video. I mentioned on another forum and someone mentioned that the thumbnail should be JPG instead of PNG. However i am using JPG and i am still having the problem. Is it Youtube has patched there system recently?