I'm sure I've done something simple, but I'm trying to figure out if it's a quick flip of a bit, or something deeper and more sinister I've got to deal with. Hope someone's got some time to help.
I've got a handful of instances of WP on my domain (www.geckotemple.com) with sub-sites @ http://www.geckotemple.com/blog, and a few others.
They've all be working well for many years, with the odd hiccup here and there, but today I upgrade the instance at the root to 3.6, and now none of the other sites (or admin pages) will show me anything other than a blank white page. No source, no error, no nothing.
Have tried getting to /blog/wp-admin and /blog/wp-admin/wp-login.php as well as the rest of the sites (some of which weren't upgraded yet) and the result is the same for all of them other than the one at the root: blank white page.