We got online some "Possible Error on saving a segment!" errors in January and February 2014.
After investigating the error mails I came to the following conclusions:

• This were real errors, the browser send a request with the segment ID of a new save request, but it send the content of the previous saved segment instead of the new one.
• this should be also captured in JS, but this did not happen
• the tracked errors occurred in IE10

That leads to the following possible reasons:
→ the used records in RowEditor::completeEdit were all correct, that means that the HtmlEditor provides wrong / old data. This would be possible since HtmlEditor is partly slow in IE.

• to exclude JS Errors as reason (like in TRANSLATE-136) we should implement TRANSLATE-52 before!