My work-around for this: I went into FORMS and found the Worksheet and DELETED the entire Worksheet. There was nothing of value on it anyway... there weren't en...

This does not work. When I go to EDIT menu, there is only an option to 'Mark as Estimated' . When this (or F8) is selected, the entry turns from dark blue type ...

I have the same problem. There is NO option to "Mark as Unestimated" for this line on the worksheet.