Hi , i would wait until support get back to you . as i got my information from the site .and maybe the latest verion is compatable but is crashing and has bugs . if its any comfort mine crashes in logic too.
about the multi core ,logic has always used multi core but now it can be used up to the 12 core machines .
have a look at apple for information about how logic uses multicore as there are way to spread the core usage .