I'm hoping that someone can help me out with a problem that's recently appeared on my site. I have moved some course activities to an orphaned block and then added a series of tiles that link to those activities. The links have worked perfectly until now -- all of a sudden some of the links have started redirecting users to the Moodle front page. I've checked the html and confirmed <a href> targets still point to the activities. So I'm at a bit of a loss.