Adobe Bridge not displaying thumbnails

I’m trying to browse the images on my camera in Adobe Bridge to open the files in Photoshop (.NEF files) and Bridge is being seriously bitchy about showing me the thumbnail previews. It seems to display them whenever it “wants” to, rather than when it’s supposed to. Over the past couple of days I’ve tried refreshing, selecting “generate high quality thumbnail” or “quick thumbnail,” switching between details on/off or whatever, with no rhyme or reason to when the preview thumbnails show up. They do show up after a while, but without any logical reason and it always seems to take forever. Right now they’ve been blank for about seven minutes. The little loading icon at the lower left corner of Bridge sometimes says 25%, sometimes 8%, etc.

How can I just make the damn thumbnails show up?