Steps to reproduce:
Open BlendedX in Studio: https://studio.edx.org/course/course-v1:edX+BlendedX+1T2015
Go to advanced settings
"The Studio servers encountered an error" appears.
This error appeared when I tried to save changes to the "Discussion Topic Mapping" section.
Specifically, I was adding a "0." in front of "General" so that it would appear first in the list of discussion topics, and I got an issue saving changes.