I have this problem as well. I got everything working by swithing connection & database charset to utf-8 BUT simultaneuosly I lost all the special characters. We run our paper in English (www.sjlas.org), but since the authors are around the world, and many of them from Scandinavia, their names often has those characters like ä, å, ö, ø, ü. Any suggestions?
@Tiziano’s solution will work in most of such situations… in my config.inc.php connection_charset and database_charset settings were set to Off. Once they were changed to utf8 the problem was resolved… hope this will help others…
A million thanks to Tiziano!! Changing the Database connection character set to utf8 was the fix!!! I had upgraded OJS from 3.2.0-3 to 3.2.1-1. I’ve spent 3 hours trying to troubleshoot the “An unexpected error has occurred. Please reload the page and try again” Logs were not helpful. Thank you so much!