Strange error while attempting an IPS pkg update (2 new Solaris Studio packages)

First the GUI "Update Manager" failed:

Downloading...

Package 1 of 2: pkg://solarisstudio/developer/solarisstudio-123/analyzer@12.3,5.11-1.0.7.0:20140612T112004Z

Package 2 of 2: pkg://solarisstudio/developer/solarisstudio-123/backend@12.3,5.11-1.0.15.0:20140529T124816Z

Installing...

Error:

Unable to clone the current boot environment.

Reverting to shell (CLI):

~ $ beadm list

BE               Active Mountpoint Space  Policy Created         

--               ------ ---------- -----  ------ -------         

11.1.18.5        -      -          29.63M static 2014-04-29 08:08

11.1.18.5-backup -      -          59.0K  static 2014-04-29 08:11

11.1.19.6        -      -          26.87M static 2014-06-12 15:28

11.1.19.6-backup -      -          60.0K  static 2014-06-12 15:31

11.1.20.5        NR     /          16.28G static 2014-07-01 13:57

11.1.20.5-backup -      -          252.0K static 2014-07-01 14:26

~ $ pkg update

            Packages to update:   2

       Create boot environment:  No