Interesting to know - maybe there is an issue in the xmlrpc_client class or in php's xmlrpc support? You'd have to trace the data all the way through to find out where things go wrong I guess.
This should probably be filed as a bug on the Moodle Tracker.
Moodle networking (MNet)
UTF8 circuit broken through an XML-RPC call
Тази дискусия е заключена и не можете да отговаряте повече в нея.