Tara: I did deactivate the plugins folder and try switching themes, but had no luck with that.
greendemiurge: It’s hosted on GoDaddy, running 5.3 on Linux.
We were able to fix the problem by rebuilding the theme and replacing the add_shortcode function, then doing a complete reinstall of WordPress.
As soon as we fixed it, an update to WordPress 3.6.1 was available…
