Dear Denis,
regarding the special character issue: could you please try switching to any other theme (better the default, such as “Twenty Eleven”) and checking if the symbols are normal or jammed. If the second, please provide your website’s URL and admin login/password by sending them to support@satoristudio.net (no disclosure guaranteed) so that I could say more by looking at the live code.
Concerning the second question, again – could you please post the URL of the page featuring the attachment interface, it is hard for me to say something meaningful until I look at what’s happening on the code level.
Sincerely,
Andrew | Satori