liquidsnakehpks: The Offline mode has always been a issue for me , as it works only if you set it to be in offline mode , and then it can stay in offline mode But we cant predict when net failures can happen and ie crashes .
So in my experience steam offline mode is broken when
1) you crash the client / force close it
2) if you are in client beta , it will try to check for update and fail to go offline
The offline mode works fine when
1) you choose the option to go offline aka steam->offline mode, i played in this mode for months
2) opt to save your log in info + automatically login (when you properly close the client ) it will go in offline mode if no net is present on next launch
I have contacted , steam support over this as well as their twitter support , they know there is a problem with it