Sorry, I didn't pay much attention to the Pictures folder issue as I don't use that folder.
SM 1.7 64-bit works great for me now but, yes, there are some issues which need to be addressed.
When I just installed it there were some cosmetic issues - I had to change colors, background, etc.
My equipment was only partially recognized - I had to edit rc.local file to change permissions for /sys/bus/usb/devices/usb* on every boot.
Hopefully those imperfections will be addressed in the next release.

On a good note:
-- it feels somewhat faster and more responsive than 32-bit
-- no need for disabling auto-debayer for fits viewer/preview (32-bit would crash with ASI2600)
-- my USB storage device gets mounted properly (with 32-bit I had to go to File Manager and click on it to get it active)

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