If you are using a blogger template of mine which was downloaded from BTemplates.com, test your blog through Internet Explorer 9. Perhaps you can see thumbnails of post summaries get squashed. Look at the image:
Probem of Post Thumbnails with IE 9
Solution for this problem is easy.
Go to "Design" --> "Edit HTML". (if you are using Blogger new interface go to "Template" --> "Edit HTML").
Now find this and remove it:
.post-body img {max-width:99% !important;}
Save the template. test your blog again through Internet Explorer 9. Thumbnail squash problem is solved.
Thumbnail Squash Problem Solved !!!
Note : But if you are using my templates which were downloaded from http://www.premiumbloggertemplates.com/, you will not face to this problem.