I have the same problem on a fresh Morhpos 3.9 installation. I installed YAM with crunch, without crunch, doesn't matter. Snoopium shows that YAM doesn't even start. I posted this at pegasosforum.de (german thread). No solution until now.

http://www.pegasosforum.de/viewtopic.php?f=6&t=5102&sid=e59692c162ded2035379c3eb294c6cad