Hi
"If I use the "x" marker in the top R corner of the frame to insert a transition, it often doesn't ask me how long for. The "transitions" tab at top of screen seems more reliable."
First time around the transition duration is not shown at the bottom of the selection screen. This is unlike earlier versions of VP where you could immediately enter a value in the box. It only shows up at the bottom of the transitions pane if the particular transition is re clicked. I don't know why this cannot be replaced.
To change the value re-click and just swipe the old value and type in the new value in seconds. The up/down arrows change in 10s of a second. If you go into Options you can set the default transition duration under the "Editing" tab. I tend to use 2 seconds.
The transition is automatically positioned centred on the join between the clips and is equally divided between them. Again this is different from earlier versions of VP where you could move the transition about.
If either or both of the clips is too short to fit the half transition at its default duration of 2 seconds, it is automatically shortened. In this case the duration covers all the shorter clip or both clips. If you don't want this you will have to either shorten the duration or lengthen the clips if possible.
On occasion or if incorrectly done, splitting the timeline can leave a very short film segment..a frame or two.. that can only be picked up by zooming in or switching into storyboard mode. If this has happened the transition cannot be correctly generated or appears with a value of 1/10s second duration. Removing the offending "clip" should cure this.
A single frame used as a "clip" will show a transition duration of 0.002 seconds.
Nat