By default, WP-Filebase sets folder permissions to 777 and file permissions to 666. This gives best compatibility with all server setups, although it’s not a secure setting.

To change the permissions that are applied during Sync, add the following two lines to your wp-config.php:

define('WPFB_PERM_FILE', 666);
define('WPFB_PERM_DIR', 755);

Put them above

/* That's all, stop editing! Happy blogging. */

All files will the be chmoded to 666 and category folders to 755 during the next sync.

Note that the numbers will be converted to octal numbers, so no leading 0 must be added like 0777!