Lightroom :: 5.2 - Thumbnails Frozen In Library Mode

One is as follows: I start in library mode/grid. I have a publish service that exports to hard drive, with some folders configured. I click on any folder, I see the correct pictures. Clicking on any folder inside the service lets me see the right pictures. Now I click on any other folder outside of the publish service (say, a collection, a smart collection, a folder... whatever) and... neither the thumbnails in the grid nor the filmstrip at the bottom are updated; the only part of the screen which is updated is the filmstrip description (i.e. I read Collection: blahblah, 123 photos).