No thumbnails on 4chan

Hi guys.
I don't know why, but none of the thumbnails on any of the boards work. I can click on the thumbnail and open the full size image though.
This just happened overnight. Have no idea how.

Also, 99% I can't post anything. After I hit reply, I just get bumped to the main page. wtf?

(btw, I tried this in both Internet Explorer and Firefox)
HALP.

I have same issue but it can't be the router's firewall because on other PCs in my house (sharing same router ofc) thumbnails work properly!

So it's something on my PC only... and I can't figure it out.