Site disappeared after WP 3.9 update

Hello!

I need some help. We have several multisites under our Dashboard. I updated our Network to WordPress 3.9 and after the update, we get a 404 error and/or a blank page on our Blogs page (https://www.hampshirereview.com/HRblogs/). All of our other multisites are working fine, but unlike the Blogs, their urls are all lowercase. I have tried changing to url to all lowercase, but that doesn’t help. We can’t get into the Dashboard for this site within our Network. It comes up with the proper url for the site’s admin, but the Dashboard is that of our main site. I have read that this has happened to others after updating to 3.9… has there been any remedy or an update to resolve this? What should we do? Please help!

Thanks!
Mandy