All of a sudden this morning, My Apps seems to vanish intermittently as a choice. Sometimes it is only Tidal that vanishes. This occurs on the web interface and on iPeng. Using the Touch interface, it took some time to find Tidal, but was ultimately successful. A few points:

When the interface problem exists, it affects a number of my players: Touch, iPhone, and ChromeCast Audio with CastBridge. That's all I've tried.

This occurred before and after the most recent update.

Once Tidal appears, I have no trouble playing music from it.