Wysihat-engine and IE8

I am having serious problems with wysihat-engine 1.0.3 in a Rails
2.3.8 application when viewing on IE8.

The first problem I encountered was that the toolbar didn’t show at
all. This was fixed with an Emulate IE7 meta tag, as documented on
their wiki. But now whenever I click into the content area, I get a
script error. The IE developer tools notes an ‘invalid argument’ error
at line 1 character 6423, but then points to a different part of the
code with its highlight of the error. I’ve tried futzing with the
code, but it’s been minified to one long line and my eyes and TextMate
hurt to look at it.

Has anyone encountered / fixed this problem already? GINMF, at least
not so far.