Steps to reproduce:
Create a PDF. Don't care how.
Using Acrobat ---
Add a few Note annotations on the page.
Open the popup notes.
Type something cool like "have you been asked when v3 will ship today

Using Javascript or whatever mark the annotation Read Only.
--> in javascript: annotationItem.readOnly = true;
Save the PDF.
Add a Reply to the popup note. Say something like "quit asking".
Again, using Javascript or whatever mark the annotation Read Only.
--> in javascript: annotationItem.readOnly = true;
Save the PDF.
Using the Tracker Viewer
Load the PDF.
Notice the popup note and replies.
- Too many replies - 4 instead of 1
- Unable to open the replies, title "bar" shows and nothing more
Using most recent viewer, build 199.
I've attached a PDF to show the problem.