Further testing reveals many more mp3 tracks where this problem occurs.
I've 'skipped' through two mp3 albums containing 60 downloaded tracks. The B2 panel display only indicates the track 'time to go' for 60% of the tracks. The rest just indicate 'xx/yy MP3', where xx = track number and yy = track count for the album. The web UI shows the correct information.
observations:
All tracks play OK.
Repeatable - same track 'time to go' is missing when album re-played or after a power down.
A track length as short as 2m36s fails, so no association with file length.
Deleting the album and recovering from backup exhibits the same problem.
When the tracks are copied to a new album compilation, the problem remains with the track.
It appears that the time taken to calculate the track length for the B2 panel display is timed out before completion for some files, and becomes locked out once the data line starts scrolling.
All tests carried out with segue off.
Regards
Keith G