Dan
I found someone in china by manipulating the bitshare's price of bter and btc38  then use the ALT's delegates auto feed to manipulate bts price in our internal market.
please ask delegate to stop using ALT's delegates auto feed script!!!!  
ALT's delegates auto feed script need to be revised and add minimum  number of sampling  price for calculation  
Thanks
temp. solution to increase the sample no. to 600
   "common3": "we use the media price, how many samples need to use",
    "median_length": 600