i was able to find the reason for and the solution to the permission
issue:

The reason is that the webserver sageserv and sage1 run as two
different users -- and, on a sidenote, only as those two for every
sage-user logging in -- which just made me almost fall over
backwards .... -- So when the .save( ) method is called sage1 creates
the file with 500 permissions which the server can not provide for
download. Chowing it accordingly enables one to download it.

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