We have just moved over to 2016 from 2013 at work and I'm testing some of our excel based programs. There's a button on one sheet that runs off code to provide results which works fine. But if I create a module to call on the button_click I receive a compile error that the sub or function is not defined. These used to work in 2013. The button_click isn't a Private Sub.

As it has sensitive coding in the button_click to our company I can't attached a spreadsheet. Has anyone come across this before and know how to get around it?