I've noticed some strange behavior with the progress bar (that shows how much of a song has played) on my Squeezebox "Classic". I first noticed this in April 2012 (sometime on or before firmware 137).
If I skip to the next (or previous) track while a song is playing, the audio changes as expected, and most items on the display update, including the track information, but progress bar (and perhaps the time) stay as they were for 2-3 seconds (and then change to indicate the start of the track). In other words, there is a delay in updating the progress bar and time when changing tracks.
In older firmware/server versions, all items on the display change (as expected) at once. Note that I am not certain this is a firmware problem (could be the server, I suppose).
The behavior slightly changed around Feb, 2013: when I advance to the next track, the progress bar momentarily goes to a different position (not zero, but perhaps 5%, but this varies), then in a second or two it jumps back to zero. The music of the next track, as before, starts immediately, the same time as this momentary display of a higher-than-zero level.
I originally reported this as a bug here:
http://bugs.slimdevices.com/show_bug.cgi?id=17952 I have not seen any comments on the bug.
Anyone know what is going on? I posted this over at forums.logitech.com as well - not sure which is a better place...