Remmina VNC authentication to Mac broken in F15

[mcgd]

I recently upgraded to F15 (x64). Under F14 I was using the remmina backports yum repository, and had no trouble connecting to a Mac using VNC. In F15, remmina is coming from the main repository, and when I try to connect, remmina simply tells me that authentication failed.

I notice that remmina is version 0.9.3-3 whereas all the plugins (including VNC) are version 0.9.2-4. Not sure if this is a problem - they all seem to have loaded ok.

Does anyone know what might be going on here, and how to resolve it? I haven't found any way to get any more information out of remmina about what it's doing. tcpdump shows that there is data being exchanged between the systems, but that's about all I've been able to find out so far.

Thanks in advance