6.1 session not appearing with 5.1?

[storm-01]

I recently created a session on my PC w/ PT 6.1. I saved it as wav. session, 24 bit, 44.1K and enforced Mac/PC compatability. I then took those files and dumped them on a Mac G3 with PT 5.1.3. at work. All of the audio files are there, but the session file looks like a blank piece of paper instead of the Pro Tools icon. Why is this the case? If compatability was inforced, what's my problem? Can a mac read a PT session that is saved as a Wav. or does it need to be a AIFF session? When going back and forth from a mac to a pc, which audio type is best, wav. or aiff?
Could it be that I need to download the Juliet file extension and that's why the mac would not see my session? It's weird because usually it wouldn't see my audio but it would see the session. I've searched the Answerbase with little help.


Stormy