Ever since my local CBS affiliate (KLAS - channel 8) has been broadcasting HDTV, I from time to time encounter "unwatchable?" programming because of the audio not being in sync with the video. I spoke to the engineer on duty last evening and he insists it's O.K. at the studio monitoring point. I know for a long time they didn't have any way to check the signal in Master Control and chats with their formar CE (Wilkenson, now deceased) were beneficial to both of us. Any suggestions or anyone else observing this. Last night the video lead the audio by approximately one-half second.