Serious Image Resizing Issues

I have been running the Twenty-Ten 1.1 theme for several months. I the past 2 weeks there have been some severe image resizing issues throughout the site. On the WP-hosted images I upload, the sizer appears to allow me to adjust the settings but they have reverted back to the image’s original size for some reason. No amt of adjusting can fix that. The only way for me to do it is for me to manually resize the photos and upload them in their new size.
The same thing with url images. It won’t allow me to adjust the size. I have 150+ posts, it’s onerous to do this manually.
What’s the bug and why did it happen?

Here’s a link to one with the sizing problem. I am leaving it this way until some tries to help me pleeeeeease! Thank you