UBB.threads PHP Forum Software Community Forums UBB.threads 7 Version 7 Support Charset Trouble, need some hints / help

Hi together,

i was trying to fix some display errors with the German ü ä ö ß Ü Ä Ö and € signs in my forum but actually i run out of ideas to fix all myself.

As you see the Information which came from the same source is displayed in a different way, the text in the Colum "Last Post" has the charset trouble:



The source text in the header is ok:


At the backend and in the user menu i have the same issue:





Here some basic informations about my installation:
Website www.viermalvier.de
online since 1999

Server Info
Server Type Linux
Server Load 0.17
Web Server Apache
PHP Version 5.6.29
MySQL Version 5.1.73-1+deb6u1
Database Size 1.06 GB

Content
Foren gesamt: 36
Themen gesamt: 40381
Beiträge gesamt: 620534

Thanks 4 support