Dear Harlequin
Are you able to copy the system console straight after the crash, and would you be able to upload the FCPXML. The 32 bit float, is a warning to state we are converting 32 bit float to 32 bit linear because of a bug in ProTools, and because we are converting from one to another we are giving a warning as we would not want to change the media itself, but we have to in this case otherwise you would not be able to work with it in ProTools, or not use any 32 bit floating source media, which is impracticle.
Yours Sincerely
James.