Alt-click is not selecting edge loops on a mac. I'm using right click but no joy.

It used to work but something has changed and I can't figure out what.
I found two ways to do this
You need to go to edit &gt; preference under the Input. turn off emulate 3 button mouse.
or
You need to go to edit &gt; preference under the Keymap search for Loop Select and change it from Ctrl + LMB  to Shift + LMB