We are currently evaluating this issue and will update this article when we have more information.
Alternative Solution for Internet Explorer 11:
- Go to Tools> Compatibility View Settings
- Add Kintera.com
- Close Window
- Go back to the window where you are adding segments and you should be able to see the new button
NOTE: You may need to remove Kintera.com from Compatibility View Settings to utilize other Sphere functions in Internet Explorer 11.
Other versions of Internet Explorer will also allow you to add new or make edits to segment categories and segments.