After upgrading to sierra with a clean format and install, I can't partition any disks. When I select a drive (not the partition) and click the partition button, I get this screen. Notice that just about all of the controls are greyed out. I had this problem before and was able to partition and format from the command line - but that's very inconvenient.
How can I unlock this?
BTW, my install was from the pre-release GM, but that should be identical to the final release.