I managed to fix this but I really don't know how. This happened only on my server and I was unable to reproduce it on singleplayer or localhost server. So I booted my main server but the problem still occured. Then I just played around the Crusher (this was the problem) and finally jumped in myself with creative mode enabled and that was it. The Crusher suddenly started to work again, so I don't know what was the problem but it is "fixed" now.
If someone knows what might have caused this, you're more than welcome to share that information with me.
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Theory is when you know something, but it doesn't work. Practice is when something works, but you don't know why. Programmers combine theory and practice: Nothing works and they don't know why.