On the admin Configuration -> E-Mail Options screen:
When I click the "Email Address (Displayed to Contact you)" option line, then type an email address in the form and click Update, the option updates to show the email address I entered as the "Value" for the option.
Then I click the "Email Address (sent FROM)" option and type an address in the form and click Update, and the email I just entered shows up for the value of the option I just edited, but at the same time the previously edited option value is cleared (blank). I tried this process of changing one option then another many times and sometimes the options will update correctly without clearing the previous option and sometimes it will clear the previous option. I can't figure out a reliable pattern, but it seems to clear the previous option about half the time.
I am using only English, and I didn't change any character settings from the default install so I assume I am using UTF-8 only.
Incidentally, I tried using IE9 instead of Firefox (my preferred browser) and that didn't make any difference (in case it was an issue with browser-side scripting.)
Can I setup a user account for you with admin permissions and let you log in to my site and try it out for yourself?