Why some posts haves some downvotes:

Example this:
safebooru.org/index.php?page=post&s=view&id=3004755

And another post with downvoted by -1:
safebooru.org/index.php?page=post&s=view&id=3007190

What the hell who is downvoting some posts, and sending to the blacklist?

PLEASE, DON'T BE ANGRY WITH ME

I still can't set my blacklist threshold lower. It's set at 0 in my options, and I'd like to put it at -2 so I can see some of these lost posts

I did read this meaasge:
"Separate individual tags, ratings and users with spaces. You must have cookies and JavaScript enabled in order for filtering to work."

I tried to enable the JavaScript, and it doesn't works.......

Try using CCleaner to clear web browser cache and try again. :)

I do love CCleaner. I'll do that and post here how it goes!

I used CCleaner, but it still won't stick. I tried using the score:<0 parameter and that worked though. My tag blacklist does work though.

Try to see if your Java version is outdated and prompt it to search for the latest release on their official website :)

This is really works for me, Thanks.