I just saved a scribe called "Test Scribe".
Whenever I try to change the properties of the 1st element, it seems to "break". The image in the timeline changes to a light-blue square, and on the canvas, it seems to shrink to a very small size.
And then I can't get it back.
Sorry you have this problem.
I exported that item after I was able to replicate the issue.
I have re-saved the file and imported it again and the issue looks like it is now resolved.
I have saved a new scribe onto your online directory called test scribe edit.
Can you try this scribe?
Attached is the file I used.