Missing vibraphone since upgrade to iPad Pro

I get the message that vibraphone is missing but available in the shop. The same is true of my songs using choir. I bought all instruments so why is this happening? I have upgraded to iPad Pro 12.9".
Music Studio
http://www.xewton.com/musicstudio/forum/
http://www.xewton.com/musicstudio/forum/viewtopic.php?f=4&t=7370