ONLY Comparators light up when a /testfor Command has been activated in a Command block for Entities
I put a comparator facing out of a Command block and then set the Scoreboard Objective of an Item 1, but it didn't light up when put on a fast clock. It did set the score to 1 but the comparator did not light up anyway. It only works if you have a /testfor command but not scoreboard...
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It does work but not if you have the FASTEST clock (setblock ~ ~-1 ~ redstone_block 0 destroy) and you are setting the score of another Entity.
I can confirm that this bug exists in Minecraft version 1.8-pre2. I set up a command block to take away the fire resistance effect from the nearest player. The effect is taken away from me but the command block that takes the effect away does not activate the comparator as it should. I know that whenever a command block performs an action, it is supposed to send a signal to the comparator but it does not do that with the fastest clock.
The only way to trigger the comparator is to splash yourself with the splash potion as fast as possible.
I have provided a screenshot of the setup I used.
Please attach a screenshot of your setup and provide the exact commands you've used.