I had been using the Image Shadow plugin to create a nice, soft frame around my images, and I'd turned off the default border in the theme. Then I realized the plugin was caching the images, and it was adding about .3 of a second to the front page load-time. So I deactivated it.

Now I want the border back, but the default produces an odd effect. The image is flush left, with a right padding area. I want it centered, and can't figure out how to get it that way.

Try this CSS Insert

.post img.size-full {
margin: 0 auto;
}

OK, thanks.

In the meantime, I had fiddled with the padding so that there was enough on the left side to counteract the radius padding. At least, I think that was what the problem was.

Now that I have disabled the plugin, I've lost the nice thin border around the front page thumbnails. That's a plugin too, Thumbnails for Excerpts. I'm not sure why the border is gone; the CSS for it is still in the CSS area of options. Curiouser and curiouser....

The CSS Inserts override the theme options as they come last in the source code.

style.css -> Theme Options -> CSS Inserts

Sorry, I deleted part of my previous post, and added a part you didn't answer yet. Obviously, it's late and I should be in bed!

And so should I