Cloth Ears wroteHave you had any success playing 24/192 FLAC files? I have exactly the same hardware setup as you and Ii'm unable to play 24/192 FLACs via the Digi+ coaxial Toslink output. Lower sample-rate files play fine (24/96) and the 24/192 files play fine via the analogue output to headphones, albeit at low quality.
I can't try this, as my active speakers can't handle 24/192. The maximum "quality" my set-up can handle is 24/96. That's ok for me for the moment. (My next buy will be the first few remastered David Bowie albums and the shop (forgot which one it is) offered them "only" in 24/96 because their testing equipment didn't show a difference between the 24/192 and the 24/96 version...)
Anyway, maybe your set-up following the Digi+ can't handle 24/192 too?
Good luck anyway!