I had been using the Cat 3.3 version with a Decklink SDI input.

I did notice a huge delay sometimes, i did figure out, if i use only one layer with the Video Input, and one or two layers with a STOPED Image, even a movie, but stoped, i get almost no delay, at least SYNC good enouth to you do not feel. If you play another layer, then the delay begins.... and goes slow and slow as more layers actived.

Gian