you could try setting it to utf-8
Look at:
https://www.ubbcentral.com/forums/ubbthreads.php/ubb/showflat/Number/256753
It is not the same error as you have but it is still a translation issue.
Could be that your database is utf-8 and before your upgrade you had it set to utf-8

Blue Man Group
There is no such thing as stupid questions. Just stupid answers