Ok, did EXACTLY what you wrote in your last post again.
Main differences are:
Gmail: the "even Mail that has been downloaded" radio button doesn't remain selected after saving settings, but that should be no problem as for this test now, the files still to be uploaded will never have been downloaded before.
4. before I always used SyncUp, but now for this test I used SyncAll as suggested
10. here's the problem! I do not see the directory structure after having done 8. and 9.
11. and therefor 11. is not working...
maybe it's a problem with my personal account on your server?