1 In an external program, update an auto-sync listed WMA track by editing it
2 In MM, Add/Rescan it
3 Auto-sync
Expected: updated track copied to device
Observed: updated track not copied to device - old version left on device.
Note: The Last Modified of the updated track is changed even though the content is not, and mysteriously also the Last Modified of all unupdated tracks is changed:

This in Win XP SP2 + WMF 11
Workaround: first delete the track from the device.
I have reproduced this each of three times here, but I'd be grateful for confirmation.
Tracked at http://www.ventismedia.com/mantis/view.php?id=5962