Yes, this is weird, I got the same problem with DirectInput and I did indeed once install a graphics tablet. I do not own it anymore. But there seems to be some driver left. Uninstalling now. Will keep you informed. Could this really be...
OH MY GOODNESS! YOU MADE IT!
In spite of the last dxdiag reporting no problems, there actually was a problem checking the InputDevices. I uninstalled the drivers of the graphics tablet and there's a window! It says something like "If you already have a Telltale account..." - YES! FCUKIN YES! I never would have thought that THIS might be the problem...
Well, I dont know if the game will run without any futher problems, but this one seems solved, finally! So I say with my worst German-Australian accent: "Good job, mate!"
Addendum: There seems to be a problem with non-standard input devices. Anyone encountering the same problems as we did, try the following:
- Plugging in the additional input hardware (like joysticks, gamepads, graphics tablets etc) OR
- Deinstalling and unplugging the additional devices
With only my keyboard and mouse installed, everything seems to work.