Hi, I have a similar problem with the Download Monitor plugin, but more than a plugin fault in my case it’s a folder permission issue.
On my host the wp uploads folder (the same used by Download Monitor) needs a 777 CHMOD permission (very risky indeed…), so anyone can surf and see the content of this directory.
I partially resolved the issue giving it a 773 permission. It’s still a risk, but at least it’s not directly visible.
My two cents ??