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Very strange. I'm able to create a block without a title on 2.0.13.1 and it shows up in Blocks Admin, just w/o a title. Seems to work fine with my setup.
Are you getting any PHP/MySQL/Smarty debug messages?
Best Regards,
James
Insanity can be defined as "doing the same thing over and over and expecting different results."
Stupidity is not a crime. Therefore, you are free to go.