More from my memory:

• My original steps
• Select another song (no change in Seek Tool)
• Change to Transient info and back again (no change in Seek Tool)
• Power-cycle the player (no change in Seek Tool)
• Switch to Aux and back again (Seek Tool starts working)

It's like the Seek Tool doesn't get told that the source has changed and that it should now be doing its thing. It appears to still think it's in Tuner mode and can sit on its backside all day, until it gets kicked by changing from Aux to MP3.