It’s a bit random, but when I hold alt or ctrl+alt, it jumps far to the right. Not sure if this is related to a recent keyboard problem I have, http://www.glyphsapp.com/forums/index.php?action=vthread&forum=1&topic=1459
See this video, http://tinypic.com/player.php?v=fow7p&s=5#.UnO8LhbA7fU