Yes, special characters is what my post is about and all the info I researched seemed to indicate few problems with special characters on newer browsers. But iphonist is an example of one who can't see them. As I said, not an issue for wp.com forums.
The link I gave, to be honest, the only one I've tried is Gimp for online photo editing and found it difficult: a big learning curve. And you are right: this is also not a wp.com issue. But lots of times people do want to post screenshots in order to show specific questions. So this seems a legitimate topic to discuss here.