@UncleLou Thanks for the info.|
I've not come across many games away from Steam that support only a single profile. Many Steamworks titles use your Steam account as a basis for a profile (using your Steam profile name for example).
UPlay and Origin have had similar problems, for example with Assassin's Creed 2.
What I've been tempted to do (for other games) is create a separate Windows account for my girlfriend and leave Steam in offline mode there. See if that works.
#9431433, By Tomb Raider 9 / reboot