The Dink Network

I've found the grotto, got the seeds from the beggar, but whenever I go into the grotto to plant the seeds, Dink makes a comment about it being a magic place, runs over to the fountain at the bottom of the screen and gets stuck behind it. I've tried moving in every direction and no luck - he's stuck fast and I have to quit the game. Is this a known bug - I checked the file discussion pages but no-one else seems to have encountered this.