On Apr 30, 2010, at 18:03, Sean Lake wrote: > Hello all, > > Is R64.app not backward compatible with 10.5 on a PPC64 machine? Does it only work if 10.5 is launched in 64 bit mode? > > Thanks, > Sean Sorry, forgot to add, it's R version 2.11.0 with GUI 1.33. Thanks again, Sean