Well, not to switch gears here, but I just remembered another cross-platform issue. This may have been fixed in v17 but for the time being I'm not switching versions in the middle of a big project.
When moving my files from the pc to the mac and back again, I've noticed that particle systems lose all their settings. so when I took this home last night I had to completely redo all the particle settings, then this morning back on the pc, they're all lost (i.e., reverted to defaults) again.
So I'm recreating them *again* and once set I'll just have to decide to work on this particular scene (pun intended? I can't tell) on either one machine or the other. Or maybe once I get them where I want them, bake them in? Haven't baked before and just tried it this morning for the first time and I can't tell if anything happened.