Lowres Cover nd5+synology+ios6

Hello!

I use since six months a nd5xs, synology 212, iphone4 with iOS 5 and the latest n-Stream ap. Software nd5 is 3.16.
In the synology media server, device list I selected "standard profile with original cover". Then"save"and all is ok. Always high res cover.

Now I Get a new iPad4 with ios6.
I go to media server, device list, select "...with original cover", save and close.
But in the iPad are only low res covers.
So I go back to the media server device list... And there ... The selection for the iPad changed automatically back to "standard"
Always the n-stream app starts new, the selection in media server/device list switch back to standard.

Yesterday I updated the iPhone4 to ios6 and suddenly there is the same problem, described with the iPad.

Can someone help?

Hope so... Thanks a lot...