Here's what I have found so far that doesn't work in Cute Editor:

Assume using IE 6.0.29 and firefox 1.5.0.1
Assume tested in your demo.

1) Paste from Word in Firefox doesn't reproduce what is in Word regarding fonts and colors (see attached documnt and try to copy and paste it) http://www.cutesoft.net/uploads/GiordanoBegali.doc
2) Paste from Word in IE doesn't reproduce what is in Word regarding fonts and colors if you select "Do you want to clean code before posting"; this same issue applies if you use the "Paste" icon too
3) Split cells right or down in IE or Firefox do not work at all
4) Create table doesn't function in Firefox as it does in IE and it creates a table of 2 by 2 by default (is this intended?)
5) In Firefox when adding a document into the editor - the site domain is added to the link text (not link itself). This shouldn't be the case as i should only see the relative path of the document displayed by default if i don't specify a document title in the document properties.  This doesn't occur in IE.