When a clip is placed on timeline the cache is not longer updated (is the cache?)
for example.. if i place a clip on timeline... and after that i disable the AUTO ROTATE flag on the properties i can't use the (new) rotated clip... (is also displayed not rotated)
to refresh the cache or the id or i don't know what it's necessary to remove the clip on project bin... after that use the rotate flag... and place the newly rotated clip on timeline to have a landscape video
here a video to explain this:
also the thumbnail on project bin is not updated when a clip is removed.