I've sent several emails to the author over the last two weeks with no response.
BTC China doesn't work, it simply doesn't display any data. Additionally The plugin is only able to be used in one location on your site, say one sidebar. However, if you want to use it on multiple sidebars, or in a sidebar and on your homepage, for example, it won't let you.
This is unfortunate, because it's a great looking plugin with lots of potential, but it's currently crippled with no support from the author.
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