[Boost-users] [ASIO] Multicast Regression?

I previously used ASIO from Boost 1.49 to send out multicast UDP messages up to 64K bytes in size without a problem. Now with ASIO from Boost 1.55 I can't seem to send out a multicast UDP message greater than 1500 bytes. I get this error: Code=1784 Category=system Message=The supplied user buffer is not valid for the requested operation I've looked at the code between Boost 1.49 and 1.55, (basic_datagram_socket.hpp, datagram_socket_services.hpp, win_iocp_socket_service_base.hpp and ipp) and very little has changed. Am I missing something that changed between the two? I'm using Windows and Microsoft Visual Studio 2010 for both 1.49 and 1.55. Hopefully someone has an idea of where to look. Thanks. --- Aaron Wright