I've done my first multi-node tour, which performs perfectly on a local hard drive.
Uploaded to my server, the single html and main xml files created by Autopano Tour reside in the same directory. Other data, xml and graphics files reside in subdirectories. No file or directory names have been changed.
When I browse to the main html file, I get an error. The main xml file fails to download.
It seems to me that your directory may have some sort of access restriction applied, such as 'view directory' but is preventing actual access to the files - well, it does allow access to the house.html file but not the others. Have you locked access to them in some way when you uploaded them.