If Opera's directory includes special characters like "ı,ş,ç,ö,ü,ğ", it won't work. For instance my directory is "D:/Prog/ı/Opera". When I execute OperaPortable.exe, It creates "D:/Prog/?/Opera/Data/profile" and some of my profile in it. Then a blank page is opening. I have to overcome this issue, bcause almost all of my folders include special Turkish characters.