Hi Adam,
My clients run into the same problem (since version 6.xx has been installed) and I can reproduce it with Word 2003 and Word 2010 (I haven't tried other versions yet).
The best way to reproduce it is to open a new empty Word document. Paste or type this content into it:
One two
three four five six seven eight nine ten eleven twelve thirteen fourteen
fifteen sixteen seventeen eighteen nineteen twenty twenty-one twenty-two
twenty-three twenty-four twenty-five twenty-six twenty-seven twenty-eight
twenty-nine thirty!
Select and copy the above content from Word. Then open a new incognito window in Internet Explorer (ctrl-shft-P), this simulates a first time visit to the page containing the CuteSoft editor.
Open the demo of the CuteSoft WYSIWYG-editor for .Net on http://cutesoft.net/ i.e.: http://cutesoft.net/example/general.aspx
Select all content in the editor and delete it. Press ctrl-v to paste the contents of the clipboard.
The result will be like this:
One twothree four five six seven eight nine ten eleven twelve thirteen fourteenfifteen sixteen seventeen eighteen nineteen twenty twenty-one twenty-twotwenty-three twenty-four twenty-five twenty-six twenty-seven twenty-eighttwenty-nine thirty!
As you can see, some of the words have been concatenated, which is unwanted behaviour.
I hope this helps you fix it! Note: after pasting with one of the Paste-buttons, the paste function worked properly, even with ctrl-v...