[Nicholas Musurca]

It may be too late for you, but I ran into the same problem and found a solution:

1) Add your DPX sequence(s) to the queue.
2) Select all sequences by Apple-clicking on the clip names one at a time.
2) Right-click on one clip name in the queue and select the “Interpret Footage…” option.
3) Select “Assume this Frame Rate” and type in the source framerate of your DPX footage.