When I use brief posts, the featured image shows up as expected. The problem is, when I select a “feature Image” the post itself gets clobbered by the featured image automagically putting itself next to the beginning text of the post. I tried looking for a setting that would prevent this but could find nothing. I also tried adding a paragraph (return) at the beginning of my posts so that at the very least, the image would not mix with my text, but that did not work either. Any suggestions would be greatly appreciated. My website address is: http://www.swanfarms.com/foodblog/
The single post featured image defaults to 500 pixels in a fluid site. On a fixed site it is calculated based off of page width and main column width. You could probably play with different fixed widths to get it how you’d like.