The NPR Media Player apparently uses floating-point numbers to represent timestamps, based on this image (click it to enlarge):
The counter displays NaN:NaN:NaN. It should show the current time count, like 01:12 (why it shows three NaNs instead of two I don’t know). NaN is the floating-point representation of “not a number,” which means something went wrong in their calculation of the timestamp.
This happened after I hibernated my computer and powered up, while the media player was paused.
(Maybe my blogging “will bring change” to the NPR Media Player 🙂 .)