I'm glad you solved it. I've followed what I assume are your posts on the Encore forum as well as here.
I did not know Encore could open these files. I have the over ten year-old Windows version (I was a beta tester for many years). It works on my Windows 11 system, although it's no less buggy now than it was then. Did you convert them on Encore for Mac, or Encore for Windows? Just curious for future reference.
My question, too. I suppose I could read the Encore 5 manual again but so much of it is wrong, never occurred me to try that. When I’m back in my office later today, perhaps…
I do talk to Don now and then but feel it’s not my job to bother him about progress on Encore 6 or the lack of it. Last we spoke, he’s still working on Encore 6. Next up is Overture 6 which will be able to open Encore and MasterTracks files, then comes the update to MTP.