Hey Baden,
I thought I'd add an unrelated issue in case you know something about it.
Since the WP upgrade to 3.5, I've been experiencing issues with my content editor (I'm using Ultimate TinyMCE) removing my collapse-o-matic colomat-close code.
It seems to happen somehow by transitioning between visual and text editor, as the problem appears in the text editor when the code (<span id...class...>Collapse</span>[/expand]) gets replaced with the way that code looks in the visual editor (Collapse[/expand).
I'm honestly not sure if this is a Ultimate TinyMCE problem or a collapse-o-matic problem, so I've posted both in Josh Lobe's forum and thought I'd mention it here as well. Any thoughts?
Thanks (Sorry?) for working double duty :)
Morgan