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.

HA ha! I have figured a way to get around it!

Go to Firefox and type about:config in the address line.
Discard the warnings but take care not to accidentally click
anywhere on the page or you will change some setting.

Go down to this entry:

network.http.max-connections

Right click it and lower the figure from the default of 30 to 10.

Reboot the system at least once.

I don't know why this problem was affected by the router firewall but
I suppose it is possible that 30 connections was seen as an attack.