Funny you mentioned that! Same here!!! Didn't even pay attention to it until I read this post but I haven't heard ATC for the last several flights!!! :o
FS2004 Forum suggested that my Avionics switch was turned off. The AT6 Texan that I fly mostly does not have a Avionics switch, checked the other A/C and sure enuf, the switch on the Baron was OFF. Works fine when it is turned on.