After logging in, patcher, and initializer complete their jobs, Horizons starts...
1) A full size window frame is drawn to the right and a down about 25% each way
2) the frame remains unfilled
3) Sound initiates normally
4) Even when in-game music starts, the visual is only an unfilled frame on the desktop
5) Desktop icons and cursor blink-shift (move a little, move back) at a regular interval
Game options were set to full screen before today's maintenance. I have to stop the program using XP's program manager, and even then I have to go to processes to stop it - trying to stop it as an application only causes it to hang