If you see the following banner appear on your jobs page:
"Your project references CircleCI 1.0 or it has no configuration. CircleCI 1.0 and projects without configuration files are no longer supported."
there is most likely a build missing its config.yml file or 1.0 version build on the page you are viewing. Once you've run a few more builds, thus pushing older builds to the next page, you'll no longer see the banner in the UI.