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Hello tongo,
If you are using the 2.0.x.x Branch:
have you checked in the, Show blocks visible in, dropdownlist. It starts out showing blocks on the frontpage, then you can check what blocks are assigned to modules by selecting them in the list.
In example, if you created a custom block, filled it with content, and then submited without making it visible, it will show up in the first block list.
But if you made it visible, and set it to show up in, lets say the news module, you must select the news module in the list before you can delete or make any changes to it.
Hope this helps,
Regards,
André Thoresen