fyi, just completely uninstalled and reinstalled DC with current download. (2015.017.20050) Also ran "repair" again. No Change.The text box properties (box) is still not working. Only the Italic button works. This needs an immediate fix. The complete text properties access needs to be restored asap.
Current appearance:

Hi,
We have released an update today that fixes the Properties Toolbar issue and you can now continue to use it outside the Commenting app as well. Please open Acrobat or Reader DC and visit Help > Check for updates to make sure you are on the latest patch.
Details about the release: https://helpx.adobe.com/acrobat/release-note/acrobat-dc-august-02-2016.html
Please let us know how it goes.
Thanks,
-ashu