Hi Victoria,
I have read quite a bit of your tutorials and am a big fan. Thank you for taking the time to look at this issue. I edited the raw files on my PC with an up to date version of Lightroom 4. I am editing for a company that wanted the processed jpeg's, and the xmp's. Since they did not have LR yet, I recommended they download a trial version quick. I spoke to Adobe this week, and they said sometimes the trial versions are limited. So I have my client purchase a full copy, un-install the trial, and re-install fresh. She is still having the same issues. Right now I am having them download a copy of my catalog to see if that temporarily allows them to view my edits. I am also sending you 2 of the .nef and .xmp files.