We've been migrating content between a number of Umbraco instances. When we went to QA we ran into a problem where the media images aren't all appearing. In fact one .swf file appears but none of the other images in the media section. If we hit on the end site then all the images come through. We copied all the images into the media directory. So it is just the admin /umbraco/ console that we can't see the images through. Has anyone else had this issue? Is there a permission problem with IIS or are the media images out of whack somehow?

Thanks