Hi there, I ve just updated the MF and the TF with Leopard Snow 10.5.8. and had no problems. The only thing that happened was that both pedals were not found  when I turned them on in update mode. So I turned them off restarded them in bank mode and they were found. After that  I turned them off  again restarded them in update mode and it worked fine.  I received mine two weeks ago so I had the first software version on them. Maybe this helps.