Dragon Professional Individual 15 and Studio 2015 / totally blocked

Hello! I have tried to use Dragon Professional Individual ( 15) with Trados 2015 and despite the great functionality to insert commands step by step, which I was searching for, now I receive an error message , ( i suppose) related to DNS' s installing, that has completely blocked Trados's functioning and so my work. The curious thing is that it regularly works with Trados 2011.
Could you suggest me anything something as from Trados' support they cannot reply on third-party application issues?
Thanks a lot.
Piero