I started mining a couple days ago when difficulty was 2M, with a hash rate of about 120.  I was getting coins every couple of hours.  Now the difficulty is about 500K and I haven't gotten anything since 9am PST, except that I got some blocks a couple minutes ago that failed verification.  Is something wrong?  The top of my block chain matches the height and hash of the top of the chain shown at the block explorer here:

http://democats.org/blockchain/?name=bipcoin