I cashed out some namecoins from a merged mining pool on Thursday (3 days ago) and I still haven't received them.  I took a look at the block chain and realized that there hasn't been a namecoin block since 6/6/2013 @ 21:51.

http://explorer.dot-bit.org/

Anyone have an idea what might be going on?

Bitcoins require 6 blocks in order to confirm (60 mins) while other cryptocoins require 15 blocks to confirm (30 mins).  Why do several of the new coins require 520?  It just seems like a random number.  Why not 500, 640, or 1000?

Looking through btc-e it looks like almost all of the alt coins have taken a big dip.  I mostly follow LTC and PPC; and they dropped from ~0.033 to ~0.025 and from ~0.0028 to ~0.0020.  What caused all of them to drop at once?  Or this is just normal market variation and nothing to get excited about? And they will eventually go back up?

Have we heard anything about how the PoS is going to work for YAC?   I didn't see anything on the main site (yacoin.org).  Is there a whitepaper for this coin yet?

I made this account a long time ago, but just recently begun posting.  Is there a way I can change my user name without making a new account?