Dear Adam,
I'm still having the exact same problem. When my HTML code includes some tables boxed into other tables I have white spaces that shouldn't appear when the code is rendered. I have checked my tags and all tags are well closed in relation with an open tag.
I do not understand why CuteEditor modifies my HTML code when I save it.
I have tried my HTML code to the demo Page of your web site and I have the same problem.
It seems that Cute Editor adds some spaces after </tr> tags and thoses spaces are interpreted.
Can you please help me on this issue ?
Kind regards,
Sébastien