Some "accented" characters turn into "?"

Lately I’ve intensively started blogging, writing travel journeys.

One thing annoys me quite a lot and takes much of my time.

My language (Serbian) uses some “accented” chars, such asč, ć, š and ž. The first two get lost somehow after I publish the blog (I’vetried composing the post in IE7, Chrome, Android browser and WP for Android) as they get converted into a qustion mark. Š and ž are ok.

Then I manually have to lector the long entry and insert the HTML code for č and ć, which takes painstakingly lot of time. Because of that I have to compose in other editors and use various workarounds for this.

Moreover, any č and ć left in the comments are also converted into ?. I’ve also experimented with some Latvian letters, that havea dash above them, and they also appeared ?.

What could be wrong? I use the latest WP on a hosted server (http://mariotomic.com/blog

Thanks.