After your post I have tried the same, and this happens in my system too. Black video, but sound is OK. Mind you I apply the effect to the whole video.

When I move the video with the effect to the first line, the black remains. After I have removed the effect, the video returns, but PD keeps rendering a couple of seconds from the cursor. PD keeps doing this even when I have removed the video and replaced the same. This is over when I restart PD and move the (same) video to the timeline. Then it plays (and shows) without rendering.

When I move the effect to the effect line right under the first timeline, with the video in lane 1, the effect of the effect is shown as expected, but rendering happens. Even after I have removed the effect from the effect line. And even when I have removed and replaced the video in the timeline without effect: rendering...

Something we may want to pass on to Cyberlink, when more of you see the same thing.

Quote After your post I have tried the same, and this happens in my system too. Black video, but sound is OK. Mind you I apply the effect to the whole vide.

I'm not sure you talk about the same problem.

I've attached two screenshots to clarify this problem as happens to me. You can see the difference. After moving the clip to lower track (not the very first one), the mask selection window becomes black, and selecting a correct area is a bit difficult.

Meantime, you can use this method.

I see what you mean. We talk about different problems. Thanks

Quote Meantime, you can use this method.

Thanks, StevenG it looks promising. I'll give it a go. _______________________________
regards, Tom
(PD365, Win10 Pro x64, Dell Precision T3500, Xeon W3670, 12GB, SSD)