Update: having terminal window open all the time I see that those seek errors are rather common. For example, I quit the player to try something from the shell; upon return few tenths of a second of a song got repeated (say, two sylables - that's how I noticed), and seek error message appeared.

Dragi "Bonzi" Raos
Zagreb, Croatia
Q#5196, MkII#80000376, 18GB green