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Ok, lets go back a couple of steps.
You stated that when you tried to edit one of your existing tracking objects by reopening the MT tool, all of your trackers are gone. When I reopen the MT tool, all my trackers are present and track as before, although the actual tracking objects (text, image or FX) are not shown. (see attached image)
Can you confirm that you see this same behavior, or post a screen capture and attach it using this button when you reply?
You also imply that you have to cancel to exit the MT tool in order to preserve your existing tracking objects, but I can click OK and my tracking objects remain (with no changes if I didn't make any when I reopned the MT tool). Can you please confirm that you see the same thing, or else describe what happens if you reopen the MT tool and hit OK without making any changes?
Please do this with a separate copy of your project. I don't want to do anything that might mess up your hard work!
Ok, I figured out what causes the problem...
If you take the sample clip "Skateboard.mp4" and add it to a blank project and add a motion tracker (or multiples) it works as expected when you select the clip and choose "Motion Tracker" again to edit it.
HOWEVER...
If I add that same clip to the timeline again, even giving it a new alias, and I try to add or edit the motion trackers on two instances of the same clip, that screws editing up.
Apparently the Motion Tracker stores or loads the motion data and trackers PER MEDIA CLIP, and not per instance or alias in the timeline.
So I was having massive problems because I had a single clip that I had trimmed into 10 different virtual clips and was trying to add Motion Trackers to each virtual clip and this made the Motion Tracker module very confused.
Unfortunately I also tried using "Precut..." with Multi Trim and it let me create motion trackers on each segment/clip but when I tried to go edit any of the ones I created the Motion Tracker window showed an empty tracker list.
I will send this finding in via the File / Rate Us & Provide Suggestions in the app.
Does anyone know of a way around this? Is there a way to use "Precut..." with Multi Trim and select all the segments created and save each into a new separate video file?