I'm sorry to hear that you've been having problems, have you filed any of these problems on our issue tracker?
We try to keep on top of issues, but unless users report them there is no guarantee that we will find out about it.
I would guess that part of the file loading does not understand that file name. Try it with a simpler filename using basic characters ( a-z ). I don't know enough to recognise what those symbols are, but I would wager that they use a complex character encoding.