I'm not going to quote Paul's post above, but I think the fault directly lies with X-Rite. Look, we have one guy writing ArgyllCMS and it runs on three systems and you can get the underlying code to compile and run on others (though no guarantee there) so I don't buy the argument that there is a difficulty here. The underlying program should have been written so that it could be ported to both Win and Mac (I'm on Win7 and have never programmed for Mac computers so I cannot attest to whether there are any special difficulties here). You will have system dependent issues that should be dealt with by the respective compilers as well as driver issues for the hardware. My pet hobby horse over the past 18 months has been the true lack of difference between Mac and PCs with respect to the difference in output from the software and hardware that we use. Has anyone ever seen any difference in a printed photograph from the same printer using output from a Mac and a PC providing you deal with the specific idiosyncrasies? Last I saw, Photoshop/Lightroom behave the same on both systems. As Paul notes, the Win installation base is far larger than the Mac base overall (I don't know if this is the case for LuLa members and if someone wants to set up a survey tool, that's fine with me as it might be an interesting data point). Given this state of affairs, it is criminal for X-Rite to release software that is not fully vetted (we Win users are fond of bashing MSFT for the exact same thing). As for me, I'm finally mastering ArgyllCMS and when my i1 comes in a week or so there is not a question of what I will be using for profiling.