Hi,
My issue is very similar to this one: http://ellislab.com/forums/viewthread/143376/P18/
In details, after updating my 1.6.8 installation to 2.1.0 all the greek characters appear as question marks. The URL is http://el.porcupine.gr/ but I have currently turned the site offline.
I have no idea what to do with my DB and I am afraid to touch it since I am a complete dump when it comes to such issues.
I host the website in Engine Hosting, so things must be a bit easier for admins to take care of it. Anyway, this is quite serious.
Thanks in advance.