[adrianrobison]

The version of Pro Tools was v 11.2 (the most current as of today) along with Mac OS 10.9.2. I was using edit groups, not clip groups. My solution that I found worked best was to close the session and reopen an older version of the session. After making those same song arrangement edits, the error did not come back. I did not shut down Pro Tools or the computer before reopening a session.