Can't start some downloads on Firefox

[Vyral-Protoss]

See my topic on reddit here and my comment to how I solved my problem : https://fr.reddit.com/r/firefox/comments/361jls/problem_cant_start_some_download_due_to_unknown/

I always used the following rules :
* * 3p block
* * 3p-frame block
* * 3p-script block
And never had a problem with it. But with the lastest version of UBlock (0.9.4.0), some downloads can't start with these rules and whitelisting doesn't fix the problem.
What is weird is that the download are form the same domain that the page I'm currently on (for example : MEGA) so they shouldn't be blocked.

I have to completely disable UBlock on the add-on menu to fix the issue.

[Vyral-Protoss]

Re-adding "behind-the-scene" in the whitelist fix the issue completly.
My bad.