In the attached example composition how would you have the Arrange Layers in Column ignore a Make Text Layer if it's empty (blank)? Currently because the Make Text Layeris set to 90pt font it renders the row as a 90pt high row. What I'm looking for is that it acts as if Row 2 isn't even there if it contains no text and renders Row 1 and Row 3 right on top of each other, see attached image below. In my actual composition there are more text rows and some layers have different fonts and colours.
In reviewing the code for the Blackmagic nodes, we found a piece that might cause video mixups like you demonstrated. This could happen when using 2 or more Receive Blackmagic Video nodes. We'll have a possible fix for you to try in the Vuo 2.0 beta.
Thanks for reporting this problem and taking the time to test various configurations.