I last wrote asking to have the featured image populated while creating a draft post. This is working great, but now it's wreaking havoc with any custom thumbnails that I've cropped using the "Post Thumbnail Editor" plugin: http://wordpress.org/extend/plugins/post-thumbnail-editor/
I realize you're not the author of that plugin, but thought I'd write anyway. What's happening (and this isn't 100% consistent, but happens about 98% of the time) is that I'll input the video URL, click on the featured image, run post thumbnail editor to crop the image how I want (for various thumbnails and image sizes), then save the post. The custom croppings won't be preserved when I save. I think via ajax the featured image is continually being overwritten by the original source thumbnail coming from the video api.
Sometimes it will be preserved if I publish the post, then go into media, find the image, and crop it there, but if I go back in to the post and edit it, it usually loses all custom croppings.
Let me know if I can explain that better..