Hi Borate
Well, the first clip loaded to the bin might not be the first clip the user wants on the timeline.:unsure: I still saw problems with an MP4 clip going blank/Black/Transparent??? and weird on the timeline ..... This is a normal clip that behaves correctly in earlier VP versions.
In VP version 7.12 Beta. Cleared cach then clip loaded.
First: Clip Preview.. There is a mixture of image and chequerboard....

Here is the same clip in . Sequence Preview. Note Aspect Ratio is 16:9 (Like the clip)..

Now....Selecting Aspect Ratio Match Content the Sequence display goes black (even though timeline cursor is on an image....

From this position NONE of the Aspect Ratio options now gets the image back in Sequence Preview.even 16:9. They all show a black frame..
Going into Clip Preview shows a chequered frame......

...and moving the cursor line turns this black...... VP is apparently "seeing" this clip as transparent
This is all a bit odd.......
Nat