Please upgrade to 2.2 here.
The 2.0 and 2.1 branches are no longer being updated.
How is it possible to have an "approved" plugin that doesn't work on IE8 on editing? Rak has spent a lot of time getting this to work, but it seems he is on the end of the line. The problem appears to be inside the core of Vanilla, which is a pity, because a Wysiwyg editor would be very nice. A solution seems just "around the corner", it would be nice to see the working "approved" editor in action.