Are all of your videos from the same camcorder?
What model is the camcorder, and what format and resolution are your videos?
What are your Project Settings, as listed under the program's Edit menu?
What format are you outputting your video as, and which media player are you using to play it?
There are also considerations like which processor you have and how much RAM, but let's focus on the fundamentals first.
Yes all videos are from the same camcorder. The camera on a Phantom 3.
Videos are all 1080p 24fps.
Project settings are 1920x1080
30fps drop-frame timecode
Exporting as HD1080 1920x1080 - MP4 - H.264.
Nope I do not have quicktime installed.
Also I do have a yellow-orange render line above the clip.
I have hit the render button and it has turned green.
However the output is still jerky and is possibly worse in the timeline playback..
I will install quicktime to see if this assists with the issue.
Installation of quicktime has made no difference.
My clip now has a green line above it as well.
At this stage I am considering requesting a refund from Adobe as I have another product that combines these clips with no issues.
The yellow-orange line above the clips (even if it's now green) indicates that there is something non-standard about your video.
i would suggest you try running the video through Handbrake (a free download) and outputting it as 1920x1080 30 fps, just to see if that makes a difference. Your goal is to use a video that does NOT have a yellow-orange line above it when it is the first clip on your timeline.
By the way, I'm assuming your computer has at least a quad-core i5 processor.
These extracted clips play smoothly in both the timeline and outside of adobe.
How were these file extracted (which means unnecessary extra compression)
If this was done in Elements that is not the way to go about.
You edit your footage directly in Elements (no pre made clips)
post a screenshot of a original Phantom clip in MediaInfo in treeview. ( i am guessing its variable framerate)