I've been doing this one too. And I got behind also. It's tough to catch up, but at least the blocks are bigger now. =)
The main site got hacked back in Mar or April, and they had to go to plan B for a couple of days, but then they got right back on track. I think they deleted the first 2 or 3 months, but the rest of the blocks are still available. I get them here:
http://www.365challenge.com.au/the-blocks/
Like roguequilter suggested, if this doesn't work, you could try a different browser or even the facebook page here:
https://www.facebook.com/365challengequiltblocks/
good luck!