I recently revisited King's Quest 8, which I have not played since acquiring this computer with the Windows Vista GUI. I had to use a XP/Vista/Win7 installer (http://www.sierrahelp.com/Patches-Updates/NewSierraInstallers.html) to get the game running.

I had Conner step on to the teleport pad in the Dimension of Death and opened the map. The Kingdom of Daventry and Castle Daventry regions showed an empty map, as though Conner had never been there. Only the captions showed with an blank map parchment.

I had Conner go back to Kingdom of Daventry the long way. Although he still had everything that he gathered since the game started, he was transported back to Sarah's house, and given a second "first piece" of the Mask of Eternity. The region was reset as though at the beginning of the game. I did not see this problem on my other computer with the Windows 98 GUI. Any helpful suggestions would be welcome.

The forums at the Sierra Help site where you got the new installer would be more equipped to help you. I'm not personally familiar with installing the games on anything newer than XP.