If the comparator gets an input from a block, it looks activated (The torches burn) but it doesn't output anything. See the attached picture.
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This is most likely because the block does not exactly have strength. It is just powered or unpowered. Blocks should have signal strength information.
Wouldn't it make sense if a weak signal gets in that normally doesn't power redstone, the output must be a weak signal too? The comparator should output the same strength as the input
@Ruben van Baarle:
No, it's consistent now, it just behaves like repeaters: http://i.imgur.com/yDs1h.png
Actually, the comparator outputs a "weak" 0 length redstone signal.
Screenshots added.