Randomize

For some reason, on a Mac laptop I use, when I try to use the randomize functions in the pattern editor, nothing seems to happen. I have tried shift f7, command f7, option f7, alt is also the option key and in the short cuts it says alt f7 so I guess I have tried that too. I have even tried just highlighting and and using the randomize function in the pull down menu. What the hell is going on here?

I actually just tried out the same scenario on my PC and the same thing is happening. Does the randomize function work on anyones Renoise or am I maybe overlooking something? I can’t really see it being any more difficult than highlighting an selecting randomize.