yes, i, first, think the same.
but it happens never on the same file. On version 4, it's work better, in version 5, it crashes randomly.
All file are prores 422 proxy with all number of line even.
This happen on my mac pro running os 10.10 with quadro 4000 with default mac driver. it work on a macbook pro 17" with the same os and on a macbook pro retaina with same os