Let's not derail this thread with "scratching". How about making a new thread for that if you're interested?
+1
[doublepost=1455133445][/doublepost]
Not just you, this happening to me as well, trying to figure out what's going on and if I do then I'll be sure to pass along.
This is happening when importing a figure box, stickie, clip, etc. the dialog box keeps popping up and will not let you mark up whatever you brought in or when it does the lines are weird.
Regular note taking seems fine but anything brought in can't be edited without the dialog box coming up.
Edit: This is using Notability
I just tried this and it worked fine. If you long press the image you'll get the edit options dialog. Since you mention it's after writing a few characters (the other poster) then I'm guessing it thinks you are pressing to select the image to something with the palm detection is not working correctly. Try to write without resting your hand on the glass to see if that makes a difference.
[doublepost=1455133487][/doublepost]Another GoodNote vs Notability item:
Notability, when you write over the image, the writing "moves" with the image, they are treated a one. This is huge.
GoodNote, the image moves but the writing stays static, so if you move an image they become misalinged.
+1 for Notability.
Another GoodNote vs Notability item:
GoodNote allows you to share a page as an Image in addition to PDF
Notability only allows for PDF.
Sometimes an Image file can be much more flexible as it doesn't contain all of the formatting baggage of a PDF file.
Also, when sharing to OneNote, and image shared gets displayed fully, a shared PDF just shows up as a link on a note.