First post because Having the exact same problem (and tried same solutions without joy)
Ingesting footage through firewire from DV Camera (MBP Core duo 2.5, external 2TB G-raid and MXo2le) audio goes out of sync (shame MXo2 doesn’t have firewire input or accept DV on HDMI but anyway!).
Tape 1 fine
Tape 2, 2 seperate parts on same tape Part 1 out of sync part 2 fine
Tape 3 out of sync
Tape 4 fine
All captured at the same time (sequentially)
Had this problem only once before
Recaptured and tape 2 now fine but having to do tape 3 for a 3rd time
When viewed with Quicktime all are fine
Any suggestions willingly tried ……
Love to know why, I can get around it but it doesn’t half waste time