Nope. Never got any help from this forum either.
I got the same error after the update and I fixed it.
I edited my php.ini file and made two changes.
1) Change the line that reads
;zend.multibyte = Off
to this
zend.multibyte = On
(remove the semicolon at the beginning and change the ‘Off’ to ‘On’ at the end)
2) Change the line that reads
;extension=php_mbstring.dll
to this
extension=php_mbstring.dll
(remove the semicolon at the beginning)
After I made those two changes my website came up.