Just re read the Help file about Preserve Scroll Position, and afraid it doesn't appear to work as I expected:
Preserve Scroll Position
With this setting enabled, QlikView will try to preserve the scroll position of tables and charts with a scroll bar when a selection is made in another object. The setting must be enabled in User Preferences: Objects as well.
The scroll position is not preserved when you close the document.
Sorry didn't spot you had already ticked the option in the first place!!
Worth a try , but have you tried creating a book mark, you can incude scroll positions in them and that actually does work as expected