I've seen a number of (seemingly random) instances where the end of a track isn't handled properly. Instead of resetting the slider to 0 and updating the title etc, the slider stays at the right hand end, the elapsed time keeps ticking up and the remaining time goes largely negative (e.g. -56 mins for a 5 min track). The problem reverts itself after a little while (last time I saw it was for about 30 seconds before resetting). 

Audio playback is unaffected, it's just display, and the Web UI shows the correct info. Playing back local FLAC files.

Version: 7.4.1 - r28676 @ Mon Sep 28 21:59:59 PDT 2009
Player Model: fab4
Firmware: 7.4.0-r7790