I'd like to add my experience, running ToMI on a Dell Vostro 1500, Chrome browser, WinXP, and Directx9.0c.
ToMI was working fine this morning. I played the game a bit in the jungle, and then tried the "treasure hunt" minigame. I got the first map, and went to the site to see the exclusive background treasure.
When I tried to load ToMI later, it would freeze on a white screen after the Lucasarts and TellTale logos come up, before the menu screen appears.
Now, it only loads as DjNDB suggests: when I unplug my internet wire.
Is it possible that the Treasure Hunt feature is crashing the game at the menu?