It’s always easier to help someone who has provided full information and remedies can be found more quickly when full information is provided.
Are you using the visual rich text editor?
Have your pre-sized the image that you are trying to upload to the exact size for Fjord’s?
Have you looked here to find “the old one” -> Manage -> Uploads?
What is your operating system?
Which browser and version of it are you using?
What is the url of the wordpress.com blog in question?
Have you paid for a css upgrade or are you just using the preview?