@R Neil Haugen The screenshot shows that the video after trimming is smaller than the frame, look at the first track. And there is a hole in this place (on the timeline and in the program window).
Yes, very odd. I see that you have a caption track. Here is a thread where a user points out that the in/out set by the text-based editing appeared to be using something (audio units?) that set things in-between frames. And your screenshot certainly appears to show that the "trim" is not exactly ON a frame.
@Stan Jones The problem occurs on the latest version, with a simple Ripple Trim operation, such a hole remains. It's not clear how to reproduce it, but I also think it's related to subtitles and a remix.
Are you dragging the Ripple Edit Tool in the timeline? When I do this, it moves by full frames, and when released, it stays with the correct frame boundary.
If you do it with only one clip (no clip above it), does it do it incorrectly?
I'm assuming you don't see the problem without a caption track? Or do you?