(Mac) Multi select not working using CMD button.

SO SIMPLE. please help. 

The basic multi select feature isnt working. I can select multiple objects with shift, but not with CMD button. 

Multi select worked perfectly for me using a windows machine. (hold control and select objects)

However, on my new mac using XD the multi select with CMD does not work. (I've tried using other buttons to see if it got changed somehow) 

- I can multiselect if I go over to libraries and hold the command key... But trying to multi select anything on my artboards using the command (or any other key) does not work. 

Please tell me how to resolve this simple simple request ahaha. 

Thanks guys