Places work erratically

Everything was fine until now. I wasn't using iPhoto for some time so when I imported new photos today and wanted to assign places I got a long wait that resulted in nothing. At first, iPhoto couldn't find a place though Google Maps located it easily, and now when I was checking whether it's able to display my other places (that it used to perfectly) I see this (or to be more specific, see nothing, just blank space).

What is this and how do I resolve this?