Error 9131 Please help!

[soosul]

I use 7.4.2 on leopard system. when I save my sessions to earlier version (6) and take it to the studio that uses 6.7 TDM the session loads the audio files but gives me immediate Error 9131 on playback or record.

I have tried 2 different studios with the 6.7 TDM version and 2 different firewire hard drives and had the same problem. however my sessions open and run with no problem on my own system and other 7.4 LE versions. ( leopard or tiger). If its a hard drive issue how come it runs fine on any 7.4 versions but not on the 6.7 version?

Any help will be appriciated