L/R Pan Problem

[Joka]

Hi,

I have D-command, HD3Accel, 192 I/O Anlog, Xmon.
Recently I upgraded to PT9 and now I am having a problem with L/R panning.
Actually the pan works perfectly on center, left and right surround but it doesn't work on left and right channel.
If I put the pan knob totally left the sound goes to right channel also.
The main meter on the D-command console and the meter on the 192 I/O shows that there is only signal on the 1-st output channel, but the sound is coming from both speakers.
It is the same if I put the pan knob totally to the right except now the meters shows that there is signal only on the 5-th channel. And the sound comes from both left and right speakers again.
Any Ideas how can I fix this problem?
Thank you all in advance.

Best Regards,
Joka