On Watch.. Music App --> "On iPhone" --> "Albums" not Siri. all albums/songs on iPhone are listed.
Before 4.3.1 I could then select any album and it would play. Now it seem only the one "Purchased through iTunes" album will play. All others just stall out and the Music App on the Watch goes into pause mode. If I then click Play it will just shuffle songs from the phone.
I have had quite and extensive back and forth with Apple Support about this today trying to figure out what the problem may be. They had no solutions for me but were taking it to the engineers I was told 🙂 . I have since added the info above to the case number.
and no music subscription.. Just my own albums (CDs and otherwise) I have uploaded to the phone.
Everything worked as expected in 4.3
Thanks!