I'm not getting this bug, which makes it weird.
If you can do me a favor:
Subscribe to the issue:
http://phpvms.net/forum/index.php?issue=3.com5
And, open /admin/modules/downloads/downloads.php, Line 184/185 is:
DownloadData::AddDownload($this->post->category, $this->post->name, $this->post->description, $this->post->link, $this->post->image);
Under it, above the } add:
DB::debug();
Please post the results in the above issue.
Thanks!