Did you edit the "Level Settings" on the build menu?
If yes, you might have deleted somethign you shouldn't in there.
If not, give me a min. to try to build a game and check it myself.
EDIT: Ok, i made a quick build test to the "simple" test map, and heres what i found out:
While hte game is built, the game doesn't copy the "newgame.tga" to your built game folder (location: gamecorebackdropsbasic).
Easy fix: go to the folder where you isntalled FPSx10 (default: C
rogram FilesThe Game CreatorsFPS Creator X10Fileslanguagebankenglishgamecorebackdropsbasic) and copy the "newgame.tga" to the same folder where your built game is located.
This will fix it
i'm reporting this to the bug topic right now.