b4f857c created the issue

I tried to download an iso image file via sftp and cyberduck wasn't able to download the whole file. It seems like it thought that the download was already completed at a lower filesize. Resuming in the downloadmanager didn't work since it didn't reread the real filesize of the file on the server. I had to reselect the file in the browser and set the action to resume for several times.