Hi,
I am running VS Simpler in Ableton 12. I have VS running in the background. I have selected Showsync as my control surface. I can get videos to play when dropping them onto audio tracks. I have the opacity slider turned up yet I am unable to get any visual as yet out of VS Simpler.
Ideas anyone please?
Hey there and welcome to the forum!
Could you maybe share the .als file so I can take a look? Screenshots or a screen recording could be helpful as well, as long as it shows the entire Live window. 
I’m assuming it’s a routing issue. You could also try and “debug” this yourself by adding a Video Monitor device right after the Video Simpler. When you trigger a note and see the video appear in the Video Monitor, then Video Simpler works fine, but the output is muted in some way downstream.
Sorry JP - it turned out I had the track muted. All ok now