Hi Mike, nope no known platform issues, I just gave it a check over here on my own Mac to make sure.

Can you please show me a screenshot of where you have placed your Randomize.htm and Randomize.js files, and also a screenshot of what you have set up for your keyboard shortcut?

One thing to note is that with Safari, when you download the Randomize.zip file, it automatically unzips it into a folder named Randomize with the 2 files contained within that folder. You've got to go into that folder and move those 2 files over, if you move just the entire folder so the whole Randomize folder is a nested folder underneath MoI's commands folder that won't work.

- Michael