Is your actual project longer or shorter than 50 minutes?
If shorter, that indicates one thing -- if longer, it indicates another.
I have continued to build the project on the time line and have frequently rendered and played through up to (currently) about 57 minutes. Everything is behaving exactly as it should, it is just that the Duration marker has stayed at 50 minutes and not followed my work.
Reading the Adobe pdf manual it states that rendered areas are marked with a green line - which suggests that my work has not been rendered beyond 50 minutes.
Also, "You designate the area to render by using the work area bar in the Expert View timeline". Perhaps what I am calling the Duration marker is actually the 'work area bar' and I simply need to move it along manually?
Why would it increment itself automatically up to 50 minutes and then switch to having to be moved manually?
Sometimes the Work Area Bar doesn't expand to length of your movie. This is especially true if you ever manually set it to cover a part of your movie. It's supposed to, but it doesn't always go back to auto mode.
If that happens, press the \ key so that your entire timelime is visible, then double-click the very top of the Work Area Bar and it should snap to the length of your movie. You will need the Work Area Bar to cover your entire movie if you want to render the timeline.
Thanks, that has sorted my problem.
Supplemental information to consider if you have not already.....
If you use
the \ and double clicking of the Work Area Bar
you use Timeline Indicator at the end of your last Timeline item and then hold down the Alt key as you hit right bracket key ]
to set the right gray tab of the Work Area Bar so that it is at the end of the Timeline content, I have found that those maneuvers do not reset the Work Area Bar gray tabs to "automatic" in that particular project. All should be "normal" when you begin a new project however.
After you do either of those two maneuvers and have the gray tabs spanning the entire Timeline content, I have observed consistently that the right gray tab will not move to the right automatically when you drag a new file to that Timeline. It remains where is was. So, you are back to where you started from and need to make corrective action.
I would agree that this matter appears to be triggered by manual adjustments to the gray tabs of the Work Area Bar in a particular project. This matter is not restricted to one particular Premiere Elements version.