Yeah....I found this out also.  Gave up trying to tweak old report.  Just having to make a new one.  What a real pain in the tush!

Noticed on the side of this thread...comments from QBO.....they must be having some of these problems also.

Whomever compiled that destructive R13 update.....go back to elementary programming school.  Learn to test your work several different ways before putting it out there!