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Thanks a lot!
Everything is working again with the D
Thanks for the help!

That really worked Awesome! Thank you!

The only problem now is that the whole text is not fat anymore and it's really hard to read.

Hey guys,

I got a big problem and I don't know why it won't work.
I'm writing a thesis right now and in this thesis is supposed to be this D: Ð. But it won't work. It's a black square and not a D.
I created a test file and that one worked, so I think our praembel file is not right. But my latex ...