Hello Airwilco,
I am not sure if I can help or not but a couple of bits of extra information might help.
1) Which version of PFE are you running?
2) What do you mean by "sometimes I don't hear ATC". Does the problem occur at the same point during each flight? Does it occur during every flight? Can you generally hear ATC?
3) I don't have access to PFE at the moment, so could you please explain what you mean by "COMM PIC PLUS"?
4) Also, you mntion pressing the roger key. THe orger key is a key sequence, CTRL/SHFT/BACK SLASH, have you altered this key sequence?
Best
Dave
PFE/FDC Beta Tester