I played DD1 & DD2 fine, but upon entering the video settings for DD3 the game would not accept any input. After forcing the game to quit, I started it up again and it begins minimized. By the sounds I hear, it is receiving my button presses, but nothing is displayed.

The icon for the DDT app is on the taskbar. Alt-tabbing did not bring the game forward, nor did using the Task Manager in Windows 7 (64-bit). I did a reinstall of the game and the problem remained. In the end, I did manage to get into the game by entering my c:\users\username\AppData\Local folder (Replace "username" with your user account name for Windows.) and delete the UserDefault.xml file. (This stores the configuration for the game.)

If anyone else has this issue and comes up with a solution that does not involve having to erase the config file, let me know and I will credit them. I was running full screen in 1920x1080.