Exactly what it says on the tin. Since the maintenance yesterday, post quote notifications and mention notifications seem to be broken.
When I viewing my user profile the "Quotes" and "Mentions" box were gone. They might have removed it or something.
Well, we wouldn't, obviously. I'm told that the site as we know it is in some level of disrepair that we weren't fully aware of until our new hosting admins informed us of this. It's possible the broken but still largely functional site we had moved to their servers was effected by a new break downs here and there. We're currently looking into the problem as we speak, considering a few new avenues, especially a few ones that might now be financially viable.