I downloaded and installed the IE9 release candidate a few days ago. At first glance the Cute Editor looks good in IE9, but there are some subtle issues that I noticed:

• Drop downs sometimes don't disappear after a value is selected (font, size, paragraph).
• When I select a section of text and try to change the font, size or color it sometimes modifies more or less than I selected.
• The formatting of some of the popup windows is a little