Hi, and found it. I just did a fresh self-hosted install at http://www.mypaperarts.com using the Coraline theme and only a handful of plugins. It had a problem with Jetpack's infinite scroll feature not working in browsers. I tested in Firefox, Safari and Chrome, and it was not functioning in any of them, though it worked fine in iPod and iPad. Deactivated all plugins except Jetpack and it worked. Reactivating one by one revealed that it was the Better WP Security plugin, version 3.4.6. seemed like an odd one to conflict with the other and I didn't see anything else about it, so I posted to let the community know.