hi,I have problems selecting the masteries I want to work on.Initially i got 2 mastery points for glider skill and then I worked on bouncing mushrooms. I now want to get back to glider skills but I now can not select that choice.What do I need to do to get back to advance my glider skills.The game at present only lets me check other masteries ,not advance glider skills.many thanks for any help is appreciated!!