i am just guessing do we need to upload your new images over here too
may be talking a fiddler logs when loading your form and see what is the error are you getting when your image is loaded..may be that could give us some idea??
i some how know that images which are not present in the above mentioned directory the call might go to the resource pool and fetcht the image from the server and come back and load it in the browser..
so i am also thinking from the dev studio do we also need to upload our new images.....not quiet sure though here just sharing my views...