I have all the main hardsurface tools bought addons installed. Does anyone have any idea which addon has changed the alt left click edge loop select? Right now I have to go into the select menu.Thanks
Look in User Preferences / Input and search key binding for ‘alt select mouse’
With hte latest 2.79 builds I can confirm this happens. 2.79a is fine, 2.79.1 to 2.79.4 it definitely no longer works.
Thank you colkai. I am using 2.79b.
I disabled mesh smart select and it works now. Thank you colkai.
No worries, it had been bugging me too, your question prompted me to dig a bit further. 
Thank you Richard for pointing me in the right direction.
