Starting today, I am suddenly seeing a strange gray frame outline on all of my WordPress posts and pages (except on the home page). On some pages, the frame appears at the top of the page. On others, and in blog posts, it appears approximately in the middle.
The only recent change I have made to my site has been modifying the background color of a div. I tried reverting back to an older version of my style sheet, but that didn't make any difference.
I have also tried disabling various plug-ins and viewing the page source for clues, but I haven't been able to make this strange anomaly go away. If anyone has suggestions, I would be most grateful.
To view the problem, see http://www.contentinsomnia.net. You won't see it on the home page. You have to click a post title or a navbar link to see it.