I just tried to create a new wallet and experienced a same issue. "Create Paper Backup" button didn't work when creating the wallet and I don't know why is that.
Anyways, you are able to create the backup after creating the wallet too.
In Step 4, click on "Finish" button, so your wallet is created. After that, click on "Wallet Properties" and then select "Backup this
wallet". In the new window, click on "Make Paper Backup".
Armory will show you the root key along with the QR code.
It should be noted that the Armory root key is not compatible with other wallets and you will always rely on Armory for recovering your wallet.
Thankyou very much for your help!
I did it somehow, not the way you did, but it worked, it froze for a while but it created a paper backup. Interesting...
Anyways, thankyou for your help!