I would strongly recommend re-installing the 32bit LinuxMCE-710 on your Core (use retain /home & settings if needed)... there really is zero performance gain under the 64bit build anyway so other than the hassle you are not loosing anything performance wise at all - and in fact in someways you will gain stability and better support for some devices.
I had already started the torrent
I still have the 64bit since at the very beginning of 710 there was some small compatibility issue with the 32bit version (I think it was serial support or something)...
I also moved the core HDD and the data drives to another computer. As expected, some network and X problems. Would the reinstall fix those, too? That'd be awesome.