Hi
".....which of the 4 bins names in the upper left is the "clip bin"? All I see is "Sequences", "video files", "audio files", and "images". No tab is labeled "clips". So what is this "clip bin" you speak of?"
Each of those tabs if clicked will open a "bin" The Video Files bin is the one usually referred to as the "Clip" bin as it contains the thumbnails of the clips you have loaded to VP. When these clips are dragged or placed on the timeline they show a green tick.
The first thing to note is you have Clip Preview and Sequence Preview windows open. That's OK.
On the left you will see that there is a row of thumbnails under the Clip preview window showing the contents of the Clip. The start of this clip is obviously black...perhaps you have a fade in effect or a black frame.** The cursor is positioned in this section so the clip preview pane is also black.
On the right is the Sequence preview window in which the cursor is someway along the first clip (which is the clip selected) and shows the frame at this position which is not black.
The sequence track shows you are in Storyboard mode with two clips present. As noted above, clip one is selected. The cursor line position here reflects the cursor line position in the Sequence pane and shows that you are displaying a frame from clip one but it is obviously beyond the black section ** so an image is shown in the Sequence window.
** Note that the black area could be a single frame at the start of clip one . From your image it is hard to tell as the clip preview cursor is positioned at the start of the clip.
The last thing to note is that you have one clip only in the "Clip bin" 🙂 and you have placed this twice on the timeline. As the storyboard frames have different images you have seemingly used the method (3) described in my post above to change one of those images using Use this Frame for Thumb Frame. The "clip bin" thumbnails is the same as in the storyboard first clip so you probably changed thumbnail two.
Hope this resolves the confusion...There is nothing wrong here..
Nat