Problem opening edited posts

[unixronin]

Still slowly working on LogJam modifications for Dreamwidth, and I’ve found an oddity.  If I make a post with LogJam, then reload it and edit it and resave it with LogJam, all goes well.  But if I edit and save that post in the web interface, THEN try to re-open it and edit it further in LogJam, I get this:

It doesn’t seem to make a difference what changes I make.  If I edit the post in any way through the web interface, I can no longer reload it via Logjam.  What am I likely running into here?