I found another problem with polish signs... in folder description and title form i cannot insert "Ä…" letter (right alt + a)... there is no such problem when i am changing photo title or description (in this form all polish fonts works great)...
to get "Ä…" i (and all people in poland:>) have to press "right alt" + "a" on my keyboard with is also used as "select all" in your admin script and probably there is a problem
Interesting, AFAIR Gr Alt for windows is like Ctrl+Alt pressed together, we added additional check for alt, will include it in next release, hope it'll resolve everything for you.