I had this bug when trying to download some system updates or apps on my Lumia 640 since early preview, and it`s still there. Im currently using the latest 10572 build version. Tried both hard and soft reset without helping.
I am guessing it's something to do with build inconsistencies, but considering the new build is expected in a few days, they are not going to bother doing anything for this build.
They expected last week in a few days qn now there is only an announcement they will make tomorrow about the next release. I find it disappointing, don't mention a timescale if you can't make it happen.
Funny side note: My Glance settings worked directly after the upgrade from 10572 to 10581, but after a good night sleep the glance settings do not work again.