This bug showed up yesterday. Don't know how general it is. The last iImage in the timeine shows up correctly in the timeline playback, but renders as a graphic rectangle when exported as a video. When I delete the image from the timeine, the previous image (in timeline order) then exports as a gray rectangle. Here's the composition that displays the problem. If you delete the last image, the previous image will render gray: https://web.descript.com/77ebcc3b-a4c5-4e2b-aa23-a4fa1faea831/a9476