As soon as I change any of the settings provided by the application "Config" on the SaaS version of Phabricator (phacility.com), the application spawns a "2 unresolved problems" message:

I actually doesn't matter what I configuration part I change, the problem is always the same. In this case it was as simple as changing the base color of the header.

Reverting back to default values resolves the issue, but yeah... then renders kind of the setting useless 😄