Thank you for the provided detailed information.
I've tried to reproduce the unexpected behavior during copy/paste, but to no avail. Everything works as expected with the version you've pointed (2015.2.728.45) as problematic and with the version from our latest release (2015.3.9.30).
However, if you desire to change the content of the clipboard when pasting in RadRichTextBox, you could attach to the RadRichTextBox.CommandExecuting event and the event handler could look like the following one:
sender, CommandExecutingEventArgs e)
DocumentFragment fragment = ClipboardEx.GetDocument();
paragraph.SpacingAfter = 0;
paragraph.SpacingBefore = 0;
I hope this helps.
If you need further assistance, please get back to us again.
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