Problem is that when the timeline is paused, a clip with an effect can't be seen in the record viewer. However, it can be seen on the client monitor if the playback was stopped with the space bar. But if stopped with the startstop button under the record monitor, the effect is not seen on the client monitor.
This also applies to titles on the sequence. And a title created with Title Tool is invisible in the source viewer unless it is in play. When stopped, title goes away.
I'm using Blackmagic Designs DeckLink Studio 2 for I/O.