Quote
It's hard to understand what's happening, but it may help to zoom in on the timeline so you can more accurately place the transition and see its effects. You can use the keyboard "+" key or click on the ⨁ icon at the lower left of PD's window.
it looks fine ,it`s the third cut when i lose the preview window the first two everything is fine .it dosen`t make a difference if i drag them from the libary or use the ones on top of the timeline. i`m stuck , all the video is there i`ve watch it right through .