I was configuring my new tablet for sculpting, changing a lot of hotkeys and shortcuts to export for later usage. After I was done I’ve reset all keybinds and settings to default and suddenly edge loop hotkey (alt + lmb/rmb) doesn’t work. Any idea how to fix this? I tried googling this issue but all the people that had this problem encountered it on Linux and I’m running Win10 
Alt + Click to select an edge loop stops working when you have emulate 3 button mouse switched on in Input -> User preference.