如果有任何unicode字符,wordpress固定链接重定向到主页

i have a client who recently change his host server and face a werid problem. i belive it's all happend for unicode characters.
Ex: http://example.com/wp-content/uploads/2014/07/dog-meghivo-430x430.jpg (it's show a images because it's don't have any unicode characters) but when a unicode characer is avaliable in url it's not showing any images and redirect to homePage.

Problem: http://example.com/wp-content/uploads/2014/07/dôg-meghivo-430x430.jpg (ô)
so i want to know how to fix this .i search many time in google for this topic but i can't find the solution. Thank

it's a new bug on new version of WordPress.It's happened because you changed your permalink after changing your server.The solution is Upload your post image again and update the post. It's should be works......but you can try to change your permalink setting's to post id