CLOSED CAPTIONS WON'T EXPORT IN MEDIA ENCODER IF EXPORTING FROM A SENT PREMIERE PROJECT FILE

Whenever my co-editor sends me a project file that she's been working on for me to open and edit on myself, for some reason ever since we both updated Premiere, when I export from her project file in Media Encoder, the closed captions won't export in the video, even when I select "burn captions," etc.  It only works if I export through Premiere, but then that slows down my workflow a lot.  Help!