I have a Lumia 950 XL and had exactly the same issue with builds 10.0.14393 on including 10.0.14393.67
I found that If you join the insider ring Gadgets updates to version
4.4.1607.11000 4.3.1607.5001
This version works properly
If you still do not have any joy set your language and region to US and let it install the language update.
Then set language and region back to what they were before.
NB I had to wait a few hours before the update to Gadgets came through.