E-AC3 again!?

[Selur]

Usual issues are:
a. misconfigured player (software filter)
b. misconfigured graphic drivers (since bit-streaming usually goes through hdmi port, and some drivers need to be configured to support bit streaming)
c. misconfigured receiver (some receivers need to be specially configured to support bit streaming)
c. wrong cable / connection (toslink only supports stereo and 5.1 bit-streaming, not all receivers support bit-streaming at all ports)
d. issues with hardware in pc
e. issues with chip in receiver

Assuming you consulted the manual or the support of the manufacturer and your receiver does not support bit-streaming, it really is sad (but not unheard of).

Cu Selur