Well, I popped the loosest inlay out and found what looked like yellow paint in the bottom of the routing. So I cleaned off the inlay, scraped what I could from the hole and used Titebond. Clamped it down, worked perfectly. The remaining 4 inlays were more resistant to my efforts, and I was afraid I would break an inlay or chip the fingerboard. I put a drop of superglue on each end of the inlay, and held it down with my fingers while it cured. A slip of waxed paper kept me from sticking to the guitar. I cleaned up the extra glue with a sharp Exacto and cabinet scraper, then wiped it all down with lemon oil. Looks great now, and everything is smooth.