I have traced the problem back to the quality update 1022.1108.2012.0. I tried to remove the update, but it keeps coming back.
The latest RP build is 22621.1192, are you up to date?
Even if you are, consider an in-place repair using 22621 ISO (3rd option in this page). You don't lose apps or personal files, just mount the image in Explorer and run setup.exe
Then get current using Windows Update.