I have buftabline on two different computers, one asked me to save files when I switch buffers the other does not

[AverageGuy]

Can someone tell me what setting is causing the difference? I've compared the .vimrc files and nothing jumps out at me. Both systems are running recent flavor of Mint and Maté.
Thanks,
Jim.

[ap]

Hey, sorry this fell through the cracks. My guess for why you are prompted is that you do not have the 'hidden' option set. Try :set hidden? on both.