Some NZBs I've been getting lately include a ".jig" file with no parts actually listed in the nzb. I'm not sure what its purpose is, but AltBinz imports the file as unpaused with size 0KB and parts 0/1 and appears to try to download it. After the rest of the collection downloads/unrars/etc, the collection will not be cleared by "Cleanup" because the .jig files is still there. If there's not some other way you want to deal with these files, I'd at least like the option to import them as paused.