You should consider reinstalling kmeaw 3.55 from the recovery menu then from the recovery restore system. Then do a fresh install of multiman with BDEMU2 as stated above somewhere. Do you have a fully funtional bluray drive with logic board?
You might need to source new pkg's for 3.55 for apps but as far as your backups go, I thought that if they worked for 3.41 through multiman then they should work for 3.55. It might seem to simple but perhaps you have only installed ofw 3.55 and that would explain how the pkg's install but won't launch backups.