Yeah bring it back. There should be a return policy with your dealer.
Check the forum before buying a different DAC 
spoke to seller and packed up the thing: it si definitely going back 
pity as it was right what I need and it did look great paired with the HA-501 I already have 
thinking now about a Nuprime DAC-9
… or just get the money back, forget about DSD with my dedicated headphones system too and keep using my beloved Metrum Hex 
Yeah DSD it’s fun playing around with…but once you realized it accounts for 0.4% of your library, you better keep the money for something else.
What did you end-up buying in the end?
found a great deal on a used (but in as new condition)… Auralic Vega
should be here by Monday
yes: I scaled up “a little bit” 
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I have 3 TEAC UD : UD-301, UD-501 and UD-503. Both UD-501 and UD-503 have the no audio problem reported with bitrate locking over USB on a Mac. My UD-301 is working perfectly. All three units are working fine over toslink optical and/or coax. The problem is only with the 500 series over USB on a Mac in exclusive mode. I’m not using ROON, but TIDAL, and it is the same exact problem.
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sold all my Teac (and Auralic) stuff, since, and replaced everything with a Metrum Adagio and Pathos Aurium: a world apart and no issue whatsoever with Macs
Just arriving at the same issue with the TEAC UD-501… no audio in exclusive mode… Damn…I note however, that TEACs own HR Audio player works perfectly in it’s own ‘exclusive mode’. So i am hopeful that this may be fixable Roon Team?