This posting is older than 6 months and can contain outdated information.
I don't know if this is a Plex issue or not but it didn't start happening until I upgraded to 9 and the first rule of thumb of troubleshooting is to determine what changed. My setup is and EyeTV Plex running on a Mini 2009 via HDMI and with digital audio out via optical to my receiver. I use a harmony remote and always leave EyeTV running, even when I switch to Plex. I send a command via applescript and RB to close all live tv windows to EyeTV and then switch to Plex. When I quit Plex I send a command to activate EyeTV and open a live TV window. Switching from EyeTV to Plex goes off without a hitch. However, now after upgrading to 9, when I switch back to EyeTV I get no sound. Upon inspecting the EyeTV audio options the audio out has been switched to "System Out" instead of "Digital Out". To fix the issue I simply have to switch it back to "Digital Out" and all is well.
I had been running this setup since May of last year without issue until I upgraded to 9. Any ideas why this is happening? Anyone know of an applescript command to tell EyeTV to automatically set audio to "Digital Out"?
Thanks in advance.