HI ND. First I would like to say that my English sucks, sorry for that.
I have played 25 games after I downloaded the DLC, but only one time I played a map from the siege pack. I played the Ruins and the Facility about 12 times. I see other people have the same problem. And I red you answer.
We have tested it and It works, be patient. Something like that... You cant just ignore this! There is a problem here!