YES. I added the youtube iFrame to the Product Description tab, I saw the video frame just fine in the backend and hit save. When looking at the frontend the product no longer loads at all but just shows the moving figure 8 and never loads. On the Storefront theme it is not a pretty sight :), but the iFrame shows up where it should on the Single Product Page and works as it should, SO it is just Xstore theme problem. As stated before: Only can load iFrame video for use next to product picture. Does not load on product description tab and only shows less than 10% vertical height on Video Tab or Woo Commerce Tab.
Thanks for digging into it.