Hi. My name is*****'m a camera repair technician with almost 30 years in the business and I'll be glad to help you with your question today.
Was the card formatted in the 7D and do you have the latest updates and drivers for Photoshop?
That is unusual although I usually use a USB card reader and everything loads fine and, unless there is something electronically wrong with the camera, I have not heard of this happening before. I'm sure iy's a settings or software issue, I just can't help you on this one so I'll turn it back over to the forum.