Yes, I think I have figured it out. To check, please go to grabit, edit server properties for fiberworld, under 'advanced options' uncheck change active group before downloading article. Click ok, exit grabit, enter grabit and try to download same nzb from fiberworld. If I'm right, grabit will also not be able to download. I'll add that option in next daily build (which you'll have to use at least with fiberworld)