This is a new enhancement of our strict enforcement of consistent default snapshots across regions. The consistency enforcement ensures that whenever you launch a class or demo from any given blueprint, the resulting end user environments are the same regardless of which region you launched it from.
Previously, the button for setting a snapshot as default on the Snapshot Details page was disabled if you attempted to set a snapshot as default while not all regional copies of the blueprint contained a copy of the snapshot.
Now, instead of the button being disabled in this scenario, you can click the button and then:
You are notified that the snapshot must be copied to other regions before it can be set as default.
You are offered the option to allow CloudShare to copy the snapshot to the other region(s) as needed and then set it as default.
You simply choose to copy and set as default and CloudShare does the work for you, copying the snapshot to all regions where the blueprint resides and then setting the snapshot as default on all regions.