The options in the "Filters & Sort" tab, are temporary settings..
"Quick View" tab, modify your default(or any other filter) sorting filter, then save.
so yeah you obviously HAD to do this before, as i just tested on 0.5b.
changing the sort under "Filters and Sort" is just a temporary switch, and the whole quickview filter is reloaded when you reboot, as i explained already.. you didnt save the change, so it is reverting back how it is supposed to