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Does

chmod 0666 *

help? i.e. ignore the owner just allow all users to read and write? I also tend to set the sticky-bit on the group for folders so that the group of the folder is inherited to the group of the files for new files that are created. i.e.

chmod 2777 .

on the root folder and all sub-folders of the folder you are sharing between systems.

I didn't try because I don't want to risk the database getting annoyed at me.