100 K Black won't overprint

Hi!
I'm experiencing a very strange and annoing problem with my new InDesign CC copy. I'm placing a 100% black text on a colored background and export as PDF. Then Acrobat Pro shows that the black text knocks out the color of the background behind the text instead of overprinting as it should.
What's very strange is that when I check the color separation in InDesign the black color DO overprint the background as it should. I've double-checked the use of swatch [BLACK], and my black appearence in settings and everything seems correct.
Now, both me and my colleague have the same problem. And it occurs even with brand new documents
Separation example:
With black: Without black (knocks out) :
Any clues what this is about and what the solution might be?
Very grateful for answers!

Problem might be solved!
I tried printing out the separation and everything came out as it should, the background wasn't knocked out. Apparently Acrobat has a bug in the separations-viewing and shows KO when it's accually OP.
Very annoying bug though! Hope that this can get closure for folks with the same "problem"!

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