Purchased music causing problems when exporting OMFs

I have been having trouble exporting OMFs for some of my projects. I get a ‘failure opening file’ error.
The first time, it took me hours to track down the offending issue - which was the music track.

Today, in a totally different project, I downloaded an unwatermarked track, re-edited it back into my project and ran into the same ‘failure opening file’ error - and it’s a different audio jungle track.

This is a huge PITA because I have to send edited tracks to my mixer separately instead of an OMF. I haven’t had this problem with files from any other stock houses/libraries.

Is this happening to anyone else? Any simple workaround other than ‘don’t use audiojungle music?’