S.C.A.R.P.I.

I have a bunch of songs made in Bandlab and am looking to remaster them by importing and tweaking the projects in Cakewalk so I can use my Ozone 8 Elements plug-in. When I load some songs, some stems will appear in the arranger list but they're not there, or the audio isn't. Am I doing something wrong or is this a common problem? Am I better off just downloading those stems from the Bandlab website and importing them in manually?