The Twenty Ten v1.1 upgrade has resulted in the width resizing information of images being ignored; the images now overlap the associated outline frame and adjacent text (checked in Firefox, IE, Chrome). They appear correctly displayed in the visual editor but not when posted.
The html in the post is in the following style:
[caption id="attachment_1460" align="alignleft" width="200" caption="Almeida"]<img class="size-medium wp-image-1460" title="Almeida" src="http://.../Almeida_village-300x225.jpg" alt="Almeida" width="200" height="150" />[/caption]
The displayed outline frame has a width 200 but the image is displayed in the original size ( it is 300 x 225 pixels pixels). The outline frame is resized vertically to the 225 pixel height of the image.
I reverted back to v1.0 and the images are now back to their correct required width (200 pixels) and no longer overlapping the text and frame.