Have you tried the following?
1) When iPod is connected to iTunes check "Sync Applications" under the "Applications" tab
2) Disconnect the iPod
3) In the iTunes menu go to "Store"/"Deauthorize Computer..."
4) Close iTunes
5) Restart iTunes
6) Go to "Store/"Authorize Computer..."
7) Sync iPod
Allan
When I try to copy a large file (7GB) from my Documents folder to a shared folder on my PC (PC and Mac are in the same network - established through a router), everything goes fine: I see the progress bar on the Mac (it takes about 14 minutes) and I see the file "growing" in size on the...