Hi there Frank,
Could you include specific links? It will help me troubleshoot.
I know that just mid-last week we implemented changes to the media uploader feature. Now images can be given an "attachment" page, which acts as a information page for that image. The image appears there with it's title, a caption (if it has one), and your blog header. You may have this on default selection for your newly uploaded images, and turning it off may solve your problem (but I'll have a better idea if you send me those links).
Cheers!