Just my opinion, but I think you'll be happier if you just apply Warp Stabilizer only to source clip, then EXPORT that clip to a good intermediate codec, then continue working with the new stabilized clip that no longer has Warp applied. Bug or no bug, I just feel that is a better, safer workflow. If one really understands the amount of work Warp is having to do to fix the clip, and then we're adding Nesting and maybe other effects and layers and such...and then scaling the output as well...I would just expect potential issues, whether this is a bug or not. It's just asking too much, too many ways for the sizing and scaling processes to go sideways in this workflow. This come from many years of working with Premiere and dealing with various workflow issues from time to time...I got in the habit in certain situations of doing things in steps. Like if using a Video DeNoiser, which took a tremendous amount of time to render (must faster these days with GPU help), I would run DeNoiser overnight to export a NEW, de-noised clip, then do the rest of my editing using the new source. In many situations when "compositing" layers in Premiere, it can be advantageous to export then continue with new clip. Actually can be pretty quick and smooth if you get used to that workflow. EDIT: will just add, if your source footage is shaky, why not fix it BEFORE you start editing? Just start with a GOOD clip and avoid the headaches is what I'm saying. Thanks Jeff
... View more