Group Documents plugin make Microsoft Word 2010 XML-RPC error

I am a Group Documents plugin user from China. It’s a great plugin and helps me a lot.
I just found a bug in the plugin. When I connect Microsoft Office 2010 through XML-RPC to my WordPress website, I found there’s error happened. But when I close Group Documents plugin, it went well. I think there must be some error in the plugin.
Could anyone tell me why the bug exists and how to remove the error from the plugin please?
Thanks a lot.

http://wordpress.org/extend/plugins/buddypress-group-documents/