I plugged a “HP USB external DVDRW Drive” to Vero4k and put in the next audio CD on my desk … and it works like a charm:
What’s different to your environment:
- it’s a Vero4k (with an external! powered hub)
- I’m on actual development staging (but not 4.9 kernel)
- ?
Addition:
Plugged the drive to a Pi3 with OSMC staging but mediacenter matrix … here “Play Disc” main menu icon only occurs if you restart the mediacenter by power->exit.
So, give the power->exit a try or even reboot with the connected drive and inserted audio CD.