Did you use CCleaner or something like that? if I clean up cache and C Drive etc I lose the Steam authentication to make offline mode work
Here we go again...
Was playing a game in offline mode, when done, exited out of steam.
Shutdown computer.
Next day, tried to run the game again, and I see:
Steam's offline mode is sure buggy.
Sure, this time I happen to have net access, and I could fix it... and mind you, when I did go online, I didn't have to enter anything, it knew who I was.