Trying To Create Encrypted Disk Images With Disk Utility.

I am trying to create encrypted read and write Disk Images of around 2 GB to 6 GB with Disk Utility.
More often than not the dmg is NOT encrypted.
It seems very hit and miss . . . . most of the time missing!
Is this process notoriously unreliable or am I likely to be doing something wrong?

I think you have cracked it Niel!
I made another, unchecking the Keychain box, and it worked perfectly.
I have been using a password which is used for other items.
Now the .dmg has been created can I check the Keychain box and if so what are the benefits?
I have never understood what the Keychain does.

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