AES-31 Export: Issues

Recently I have attempted exporting a WL Montage as a AES-31 file. When attempting to import this file into Sadie 6, it fails with an accompanying log file. (not attached)

The interesting bit is that doing the same exercise the other way around is not problematic. I can easily import AES files created by Sadie 6. In both cases I have used the same source files. (16 bit Stereo Wav)

Could someone with some experience in this please rapport as to the possible causes?

Onto another question: In the case of the Sadie to WL - Why are fades not retained.i.e. the temporary fade not the rendered file.