Ok in English. I have actually same problem (Rapidshare, free account version)
When part of the file is downloaded and the connection is interupted FRD doesn`t delete the downloaded part (it could not continue old dowloading anyway for Rapidshare free account) and it has a problem with start of dowloading file again from scratch (maybe it is trying to continue downloading the file).
So program get in the loop that you have to stop manualy. Delete the downloaded part of the file and add link again to FRD, than everything starts to works fine.