It seems totally random as to when it fails
My procedure:
I go into My Cigars, drill down through the Humidor, Cubans, Marca, Vitola.
I then click on the arrow for "Cigars on the Move"
I choose option 3 "Move to Humidor..."
On the left dial I select 3 (or #), in the right dial I choose the other Humidor.
I click Save and......Bam, back to the Apple Springboard.
I just ran a test moving 3 cigars and it failed
I then ran it moving 2 and it completed successfully.
Then I ran it with 2 and it failed, and ran it again with 3 and it completed