Mine is a Marantz SR8012 and playback is via a Sony UBP-X800M2 Multi-region player.What make/model avr or prepro are you using?
I have a Denon 6200 connected to an Oppo 203.
GZAP1 over at avsforum.com who is getting Atmos content on his elevated front/rears has a Denon 4400H/Oppo 203.
Never had a Dolby issue before on all the other numerous Dolby Atmos releases I have.