Hi Peter,
In Corona v6 we only officially support Ornatrix v5. So there might be some unexpected behaviour with Ornatrix v6.
In the Corona v7 daily builds we have updated to the latest API of Ornatrix which means we will support Ornatrix v7.
I hope this provides some useful information.
If you are able to send a scene I can test to see if there is a crash in the latest daily builds. Instructions on how to send the scene to me can be found in my signature.
Cheers,
Rowan