There was a ddos attack. They have fixed the issue! the SQl Database was froze all payments came through afterwards. Also for your time The pool owner doubled rewards for the next 3 blocks.  I thought was nice.  Some guy named mojo falsely accused the pool of having 3 percent fees.. but was quoting the decimal place logic holder of a totaly diffrent script. You could have checked the pplns fee on its api at!
http://graftpool.net/api/pool/stats/pplns

all that happend at one time so not sure who did the ddos but is fixed now. .