the laptop is about 6 years old and runs a wobbly windows XP pro on 1,5 GB RAM (transfer speed is 0,5 GB/hr, not really an option) and the main PC runs Vista 64 4GB RAM.
Same version of the same antivirus program, both are set to scan ipod only on demand. Exchange of drive letter did not make any difference.
Neither port change or exchange of cable did make any difference until the latest itunes update everything worked fine (no other updates made around that time).
After a complete deinstall and reinstall of an older version of iTunes - no change.
Complete format of ipod and "let itunes find ipod to restore" - no change.
Checked all involved drives and media - no errors - no change.
Restore Pod on laptop and move over to main PC - no change.
I'm getting rather frustrated as I simply cannot figure out what is the problem.
The most bugging part is I use mostly audiobooks (audible format) so Songbird is not an option either as very few other programs have aa/aax plugins (which is the only reason I'm using iTunes). Last time I used the pod, I simply wanted to sync the library, no errors, no hiccups, eject and ... no audiobooks, no music, but 111 GB of other.