We're having exactly the same problem, with the same Philips 9350 unit, and using the download into Express Scribe. Any recording plays fine in the Philips playback utility, but once we "load" it into ExpScribe, the length goes to "0", and there is nothing to play.
Also, the Priority marking from the Philips never shows up in Express Scribe as other than normal.
We're using V3.21 downloaded about 10 days ago.
Please let us know ASAP what we should try next!
Bruce in Huntsville, AL.