UAPP won't play 24/96 files

[ambref]

I have a problem with UAPP, installed on my Galaxy S4 tablet. It plays 16/44 CD music files OK, but when I try to play 24/96 FLAC music files (downloaded from Acoustic Sounds) it will not play them. And doing that disables UAPP so it won't play anything until I have reset UAPP by turning it off then on.

Any ideas?